See also: Tau, TAU, tàu, Tàu, tãu, tău, Tău, taʻu, ta'u, and täü

EnglishEdit

EtymologyEdit

Ancient Greek Alphabet

sigma
  
upsilon
Τ τ
Ancient Greek: ταῦ
Wikipedia article on tau
When a circle’s radius is 1 unit, its circumference is twice the value of pi (2π) or tau (τ; sense 6) units.
An image of neurons. The taus or tau proteins (sense 7) are stained red.

From Middle English tau, taue, from Latin tau, from Ancient Greek ταῦ (taû) and Hebrew תָּו (tav).

Sense 6 (“mathematical constant equal to 2π”) was used by Joseph M. Lindenberg in 1991, and popularized by the American educator and entrepreneur Michael Hartl in a 2010 paper which explains that τ resembles π; and that τ is the Greek equivalent of t, the first letter of turn, and 2π corresponds to one turn of a circle with a radius of one unit.[1]

Sense 8.1 (“short for tau lepton or tau particle”) was coined by the American physicist Martin Lewis Perl (1927–2014) after the first letter of Ancient Greek τρίτον (tríton, third), since the tau lepton or tauon was the third charged lepton discovered.[2]

PronunciationEdit

NounEdit

tau (plural taus)

  1. The letter Τ/τ in the Greek, Hebrew, and ancient Semitic alphabets; being the nineteenth letter of the Classical and Modern Greek, and the twenty-first letter of the Old and Ancient Greek alphabets.
  2. A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
    • 1658, Thomas Browne, “The Garden of Cyrus. []. Chapter I.”, in Hydriotaphia, Urne-buriall, [] Together with The Garden of Cyrus, [], London: [] Hen[ry] Brome [], →OCLC; reprinted as Hydriotaphia (The English Replicas), New York, N.Y.: Payson & Clarke Ltd., 1927, →OCLC, page 96:
      Nor ſhall we take in the myſticall Tau, or the Croſſe of our bleſſed Saviour, which having in ſome deſcriptions an Empedon or croſſing foot-ſtay, made not one ſingle tranſverſion.
    1. (Christianity) A crosier with a Τ-shaped head.
  3. The ankh symbol ().
    Synonym: crux ansata
  4. (astronomy) Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation.
  5. (finance) A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.
    Synonyms: kappa, vega
    Hypernym: Greeks (includes a list of coordinate terms)
  6. (mathematics, neologism) Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071).
  7. (neurology) Short for tau protein (a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases).
  8. (physics) Chiefly written τ.
    1. Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”).
    2. (historical) Short for tau meson, now known as a kaon.

Derived termsEdit

TranslationsEdit

ReferencesEdit

  1. ^ Michael Hartl (28 June 2010, updated 28 June 2020), “The Tau Manifesto”, in Tauday.com[1], archived from the original on 2022-01-30, section 4.1 (One Turn):
    There are two main reasons to use τ for the circle constant. The first is that τ visually resembles π: after centuries of use, the association of π with the circle constant is unavoidable, [] The second reason is that τ corresponds to one turn of a circle, and you may have noticed that “τ” and “turn” both start with a “t” sound.
  2. ^ Martin L[ewis] Perl (April 1977) Evidence for, and Properties of, the New Charged Heavy Lepton (SLAC-PUB-1923)‎[2], archived from the original on 2021-07-09, section 1 (Introduction), page 3; published in Trần Thanh Vân, editor, Proceedings of the Twelfth Rencontre de Moriond: Flaine, Haute-Savoie, France, March, 6–18, 1977 (Moriond Proceedings; 19), volume 1 (Leptons and Multileptons), Orsay, Paris: Laboratoire de Physique Théorique et Particules Elémentaires [Laboratory of Theoretical Physics and Elementary Particles], Université de Paris-Sud, 1977, →OCLC, pages 75–97:
    Since there is now substantial evidence that it [the new elementary particle] is a lepton, we wish to designate it by a lower case Greek letter. We use   because it appears to be the third charged lepton to be found and τριτον means third in Greek. We feel the old use of   to designate the three pion decay mode of the K is now obsolete.

Further readingEdit

AnagramsEdit

'Are'areEdit

VerbEdit

tau

  1. to give

ReferencesEdit

CatalanEdit

PronunciationEdit

NounEdit

tau f (plural taus)

  1. Tau; the Greek letter Τ (lowercase τ).
  2. Tav; the Hebrew letter ת‎.
  3. (religion) A tau cross.

CzechEdit

PronunciationEdit

NounEdit

tau n

  1. tau (Greek letter)

Further readingEdit

  • tau in Kartotéka Novočeského lexikálního archivu
  • tau in Akademický slovník cizích slov, 1995, at prirucka.ujc.cas.cz

FinnishEdit

EtymologyEdit

Borrowed from Ancient Greek ταῦ (taû).

Greek letter
Ττ Previous: sigma
Next: ypsilon
 
Finnish Wikipedia has an article on:
Wikipedia fi

PronunciationEdit

  • IPA(key): /ˈtɑu̯/, [ˈt̪ɑu̯]
  • Rhymes: -ɑu
  • Syllabification(key): tau

NounEdit

tau

  1. tau (Greek letter)
  2. tauon, tau (elementary particle)

DeclensionEdit

Inflection of tau (Kotus type 21/rosé, no gradation)
nominative tau taut
genitive taun tauiden
tauitten
partitive tauta tauita
illative tauhun tauihin
singular plural
nominative tau taut
accusative nom. tau taut
gen. taun
genitive taun tauiden
tauitten
partitive tauta tauita
inessive taussa tauissa
elative tausta tauista
illative tauhun tauihin
adessive taulla tauilla
ablative taulta tauilta
allative taulle tauille
essive tauna tauina
translative tauksi tauiksi
instructive tauin
abessive tautta tauitta
comitative tauineen
Possessive forms of tau (type rosé)
possessor singular plural
1st person tauni taumme
2nd person tausi taunne
3rd person taunsa

AnagramsEdit

FrenchEdit

Alternative formsEdit

PronunciationEdit

NounEdit

tau m (plural tau or taus)

  1. tau (Greek letter)
  2. (physics) tau, tauon

Derived termsEdit

Further readingEdit

AnagramsEdit

German Low GermanEdit

Alternative formsEdit

  • to (in some dialects)

EtymologyEdit

Middle Low German .

PrepositionEdit

tau

  1. (in some dialects) to

Derived termsEdit

HuicholEdit

NounEdit

tau

  1. sun

HungarianEdit

 
Hungarian Wikipedia has an article on:
Wikipedia hu

EtymologyEdit

From Ancient Greek ταῦ (taû).

PronunciationEdit

  • IPA(key): [ˈtɒu]
  • Hyphenation: tau
  • Rhymes: -u

NounEdit

tau (plural tauk)

  1. tau (Greek letter)

DeclensionEdit

Inflection (stem in long/high vowel, back harmony)
singular plural
nominative tau tauk
accusative taut taukat
dative taunak tauknak
instrumental tauval taukkal
causal-final tauért taukért
translative tauvá taukká
terminative tauig taukig
essive-formal tauként taukként
essive-modal
inessive tauban taukban
superessive taun taukon
adessive taunál tauknál
illative tauba taukba
sublative taura taukra
allative tauhoz taukhoz
elative tauból taukból
delative tauról taukról
ablative tautól tauktól
non-attributive
possessive - singular
taué tauké
non-attributive
possessive - plural
tauéi taukéi
Possessive forms of tau
possessor single possession multiple possessions
1st person sing. taum tauim
2nd person sing. taud tauid
3rd person sing. tauja taui
1st person plural taunk tauink
2nd person plural tautok tauitok
3rd person plural taujuk tauik

IbanEdit

PronunciationEdit

VerbEdit

tau

  1. ought, should

IcelandicEdit

EtymologyEdit

Borrowed from Danish tøj.

PronunciationEdit

NounEdit

tau n (genitive singular taus, no plural)

  1. fabric
  2. clothing

DeclensionEdit

IndonesianEdit

Etymology 1Edit

PronunciationEdit

  • IPA(key): /ta.ʊ/
  • Hyphenation: ta.u

VerbEdit

tau

  1. (colloquial) to know

Etymology 2Edit

Learned borrowing from Ancient Greek ταῦ (taû).

PronunciationEdit

NounEdit

tau

  1. the Greek letter tau (Τ or τ)

Further readingEdit

ItalianEdit

 
Italian Wikipedia has an article on:
Wikipedia it

PronunciationEdit

  • IPA(key): /ˈtaw/
  • Rhymes: -aw
  • Syllabification: tàu

NounEdit

tau m or f (invariable)

  1. tau (Greek letter)

AnagramsEdit

JapaneseEdit

RomanizationEdit

tau

  1. Rōmaji transcription of たう

KamberaEdit

VerbEdit

tau

  1. person
    na tau na pa-hi dà-nggu
    the person that I cried with

ReferencesEdit

  • Marian Klamer (1998) A Grammar of Kambera, Berlin, New York: Mouton de Gruyter, →ISBN, page 328

KapampanganEdit

Alternative formsEdit

Etymology 1Edit

From Proto-Philippine *tau, from Proto-Malayo-Polynesian *tau, from Proto-Austronesian *Cau.

PronunciationEdit

  • Hyphenation: ta‧u
  • IPA(key): /ˈtau/, [ˈtäː.u]

NounEdit

táu

  1. person
  2. human

Etymology 2Edit

PronunciationEdit

  • Hyphenation: ta‧u
  • IPA(key): /təˈu/, [təˈuː]

NounEdit

taú

  1. feast; party; banquet

KendayanEdit

NumeralEdit

tau

  1. three

LithuanianEdit

PronounEdit

tau

  1. (second-person singular) dative form of tu.

MalayEdit

Alternative formsEdit

Etymology 1Edit

From Proto-Malayic *tahu(ʔ), from Proto-Malayo-Chamic, from Proto-Malayo-Sumbawan, from Proto-Malayo-Polynesian *taqu, from Proto-Austronesian *Caqu.

PronunciationEdit

VerbEdit

tau

  1. Nonstandard spelling of tahu.

Etymology 2Edit

Borrowed from English tau, from Ancient Greek ταῦ (taû).

PronunciationEdit

NounEdit

tau (Jawi spelling تاو‎, plural tau-tau, informal 1st possessive tauku, 2nd possessive taumu, 3rd possessive taunya)

  1. the Greek letter tau (Τ or τ)

Further readingEdit

MaoriEdit

Etymology 1Edit

From Proto-Polynesian *taqu (compare Hawaiian kau), from Proto-Oceanic, from Proto-Malayo-Polynesian *taqun (compare Malay tahun, Tagalog taón).

NounEdit

tau

  1. year (time it takes for the Earth to complete one revolution of the Sun)
  2. year (time it takes for any planetary body to make one revolution around another body)
  3. year (a period between set dates that mark a year)
  4. year (scheduled part of a calendar year spent in a specific activity)
  5. year (Julian year)
  6. year (level or grade at school or college)

Etymology 2Edit

From Proto-Polynesian *tau, from Proto-Oceanic, from Proto-Malayo-Polynesian *taʀuq (compare Malay taruh).

VerbEdit

tau

  1. to settle

Etymology 3Edit

From Proto-Polynesian *tau, from Proto-Oceanic, from Proto-Malayo-Polynesian *taqu, from Proto-Austronesian *Caqu (compare Malay tahu).

NounEdit

tau (used in the form mātau)

  1. knowledge

VerbEdit

tau (used in the form mātau)

  1. (stative) to know

ReferencesEdit

  • tau” in John C. Moorfield, Te Aka: Maori-English, English-Maori Dictionary and Index, 3rd edition, Longman/Pearson Education New Zealand, 2011, →ISBN.

Min NanEdit

For pronunciation and definitions of tau – see (“home; nearby”).
(This character, tau, is the Pe̍h-ōe-jī form of .)

MinangkabauEdit

EtymologyEdit

From Proto-Malayic *tahu(ʔ), from Proto-Malayo-Chamic, from Proto-Malayo-Sumbawan, from Proto-Malayo-Polynesian *taqu, from Proto-Austronesian *Caqu.

VerbEdit

tau

  1. to know

NiueanEdit

Etymology 1Edit

From Proto-Polynesian *taqu, from Proto-Oceanic, from Proto-Malayo-Polynesian *taqun.

NounEdit

tau

  1. year

Etymology 2Edit

From Proto-Polynesian *tau, from Proto-Oceanic, from Proto-Malayo-Polynesian *taʀuŋ.

VerbEdit

tau

  1. fight

North FrisianEdit

North Frisian cardinal numbers
 <  1 2 3  > 
    Cardinal : tau
    Ordinal : öler

EtymologyEdit

From Old Frisian twā. Compare Mooring North Frisian twäär, tou.

PronunciationEdit

IPA(key): /tau/

NumeralEdit

tau

  1. (Föhr-Amrum, Heligoland, Sylt) two

Coordinate termsEdit

Norwegian BokmålEdit

 
Norwegian Wikipedia has an article on:
Wikipedia no

Etymology 1Edit

From Old Norse tog (rope).

NounEdit

tau n (definite singular tauet, indefinite plural tau, definite plural taua or tauene)

  1. a rope
  2. (physics) tau lepton
  3. tau (Greek letter)
SynonymsEdit
Derived termsEdit

Etymology 2Edit

VerbEdit

tau

  1. imperative of taue

ReferencesEdit

Norwegian NynorskEdit

 
Norwegian Nynorsk Wikipedia has an article on:
Wikipedia nn

Etymology 1Edit

From earlier and Old Norse tog (rope), from Proto-Germanic *taugō.

Alternative formsEdit

NounEdit

tau n (definite singular tauet, indefinite plural tau, definite plural taua)

  1. a rope
SynonymsEdit
Derived termsEdit

Etymology 2Edit

 
Norwegian Nynorsk Wikipedia has an article on:
Wikipedia nn

Borrowed from Ancient Greek ταῦ (taû).

NounEdit

tau m (definite singular tauen, indefinite plural tauar, definite plural tauane)

  1. tau: The letter Τ/τ in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient Greek.
  2. (physics) tau lepton

ReferencesEdit

AnagramsEdit

OccitanEdit

EtymologyEdit

From Latin talis.

PronunciationEdit

AdjectiveEdit

tau m (feminine singular tala, masculine plural taus, feminine plural talas)

  1. (Gascony, Provençal, Limousin, Vivaro-alpine, Auvergne) such

Alternative formsEdit

PolishEdit

 
Polish Wikipedia has an article on:
Wikipedia pl

EtymologyEdit

Borrowed from Ancient Greek ταῦ (taû), from Phoenician 𐤕 (t /taw/).

PronunciationEdit

NounEdit

tau n (indeclinable)

  1. tau (Greek letter Τ, τ)

Further readingEdit

  • tau in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
  • tau in Polish dictionaries at PWN

PortugueseEdit

PronunciationEdit

NounEdit

tau m (plural taus)

  1. tau (name of the Greek letter Τ, τ)
  2. (physics) tauon

SothoEdit

NounEdit

tau class 9/10 (plural ditau)

  1. lion

DescendantsEdit

  • Phuthi: idawû

SpanishEdit

PronunciationEdit

  • IPA(key): /ˈtau/ [ˈt̪au̯]
  • (file)
  • Rhymes: -au
  • Syllabification: tau

NounEdit

tau f (plural taus)

  1. tau; the Greek letter Τ, τ
  2. tauon (elementary particle)
    Synonym: tauón

See alsoEdit

Further readingEdit

TahitianEdit

AdjectiveEdit

tau

  1. some

SynonymsEdit

ReferencesEdit

TausugEdit

EtymologyEdit

From Proto-Malayo-Polynesian *tau.

NounEdit

tau

  1. person
  2. human

Derived termsEdit

TernateEdit

PronunciationEdit

VerbEdit

tau

  1. to pull

ConjugationEdit

Conjugation of tau
Singular Plural
Inclusive Exclusive
1st totau fotau mitau
2nd notau nitau
3rd Masculine otau itau, yotau
Feminine motau
Neuter itau
- archaic

ReferencesEdit

  • Rika Hayami-Allen (2001) A descriptive study of the language of Ternate, the northern Moluccas, Indonesia, University of Pittsburgh

TetumEdit

EtymologyEdit

From Proto-Malayo-Polynesian *taʀuq, compare Maori tau and Indonesian taruh.

VerbEdit

tau

  1. to put, to place

Tocharian BEdit

EtymologyEdit

From Middle Chinese (MC təuX).[1]

NounEdit

tau ? sg (irregular plural towä or tom or taum)

  1. a dry measure, roughly equivalent to ten quarts or 1.25 pecks

ReferencesEdit

  1. ^ Adams, Douglas Q. (1999), “tau”, in A dictionary of Tocharian B (Leiden Studies in Indo-European; 10), Amsterdam, Atlanta: Rodopi, →ISBN

TokelauanEdit

PronunciationEdit

  • IPA(key): /ˈta.u/
  • Hyphenation: ta‧u

Etymology 1Edit

From Proto-Polynesian *te-qa-u.

DeterminerEdit

tau

  1. (alienable, definite) thy, your
See alsoEdit

Etymology 2Edit

From Proto-Polynesian *taqu. Cognates include Hawaiian kau and Samoan tau.

NounEdit

tau

  1. season
  2. weather
  3. climate

Etymology 3Edit

From Proto-Polynesian *tau. Cognates include Tongan tou and Samoan tau.

VerbEdit

tau

  1. (transitive) to pick
Usage notesEdit
  • tau is used to refer to flowers and fruits, with the exception of the coconut and pandanus.

Etymology 4Edit

From Proto-Polynesian *tau. Cognates include Tongan tau and Samoan tau.

VerbEdit

tau

  1. (intransitive) to fight; to quarrel
  2. (intransitive) to compete

Etymology 5Edit

From Proto-Polynesian *tau. Cognates include Maori tau and Samoan tau.

VerbEdit

tau (plural tatau)

  1. (intransitive) to hit
  2. (intransitive) to land
  3. (intransitive) to arrive
  4. (intransitive) to anchor
  5. (intransitive, of fish) to settle down

Etymology 6Edit

From Proto-Polynesian *tau. Cognates include Tuvaluan tau and Samoan tau.

VerbEdit

tau

  1. (transitive, of months) to count

Etymology 7Edit

From Proto-Polynesian *tau. Cognates include Rapa tau and Samoan tau.

NounEdit

tau

  1. The point where the keel meets the stern of the canoe.

Etymology 8Edit

NounEdit

tau

  1. Fresh nest fern leaves, used to cover a traditional oven.

Etymology 9Edit

ParticleEdit

tau

  1. Used to indicate the exclusiveness of the following noun or pronoun; just, only, merely

Etymology 10Edit

ParticleEdit

tau

  1. Used to indicate the focus lies on the following noun; concerning, regarding

Etymology 11Edit

ParticleEdit

tau

  1. Used to indicate that the action of the following verb is beginning; starting to; beginning to

Etymology 12Edit

VerbEdit

tau

  1. Only used in tau ma (to be fed up with)

ReferencesEdit

  • R. Simona, editor (1986) Tokelau Dictionary[3], Auckland: Office of Tokelau Affairs, page 342

TonganEdit

EtymologyEdit

From Proto-Polynesian *tau, from Proto-Malayo-Polynesian *taʀuŋ.

PronunciationEdit

VerbEdit

tau

  1. fight

TswanaEdit

PronunciationEdit

NounEdit

tau class 9/10 (plural ditau)

  1. lion

VietnameseEdit

PronunciationEdit

PronounEdit

tau

  1. Central Vietnam form of tao (I/me)

AnagramsEdit

WelshEdit

PronunciationEdit

VerbEdit

tau

  1. (literary) third-person singular present indicative/future of tewi

MutationEdit

Welsh mutation
radical soft nasal aspirate
tau dau nhau thau
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

White HmongEdit

EtymologyEdit

From Proto-Hmong *təuk, from Old Chinese (OC *tɯːɡ).

PronunciationEdit

VerbEdit

tau

  1. to get, gain, obtain
  2. (used preverbally) perfective action marker
    Kuv tsis tau ua.I didn't do that.
  3. (used postverbally) potential mood marker
    Ua tau.May be done.

ReferencesEdit

  • Heimbach, Ernest E. (1979) White Hmong — English Dictionary[4], SEAP Publications, →ISBN.
  • Ratliff, Martha (2010) Hmong-Mien language history (Studies in Language Change; 8), Camberra, Australia: Pacific Linguistics, →ISBN.

WocconEdit

NounEdit

tau

  1. fire