fourfold

English

English numbers ^(edit)

	40
←  3	4	5  →
Cardinal: four     Ordinal: fourth     Latinate ordinal: quartary, quaternary     Reverse order ordinal: fourth to last, fourth from last, last but three     Latinate reverse order ordinal: preantepenultimate     Adverbial: four times     Multiplier: fourfold     Latinate multiplier: quadruple     Distributive: quadruply     Group collective: foursome     Multipart collective: quadruplet     Greek or Latinate collective: tetrad     Greek collective prefix: tetra-, tessera-     Latinate collective prefix: quadri-     Fractional: quarter, fourth     Latinate fractional prefix: quadrant-     Elemental: quadruplet     Greek prefix: tetarto-     Number of musicians: quartet     Number of years: quadrennium, olympiad

Alternative forms

• four-fold

Etymology

From Middle English fourfold, fourefold, from Old English fēowerfeald. Equivalent to four +‎ -fold. Cognate with Dutch viervoud, Gothic 𐍆𐌹𐌳𐌿𐍂𐍆𐌰𐌻𐌸𐍃 (fidurfalþs).

Adjective

fourfold (not comparable)

1. Four times as great; quadruple.
2. Comprised of four individual members.
   • 1895, [Charles Hardy], The Aural System […]‎^[1], page 5:

     Most pupils have a fourfold object in studying a language; they wish to be able to read and write, to speak and to understand it.

Synonyms

• quadruple, quadruplicate

Translations

four times as great

• Bulgarian: четворен (četvoren)
• Czech: čtyřnásobný (cs)
• Dutch: viervoudig (nl)
• Finnish: nelinkertainen
• Galician: catro veces, cuádruple (gl)
• Gothic: 𐍆𐌹𐌳𐌿𐍂𐍆𐌰𐌻𐌸𐍃 (fidurfalþs)
• Hindi: चहुरा (hi) m (cahurā), चौघरा (hi) m (caughrā), पाव (hi) m (pāv), चौगुना (hi) (caugunā)
• Hungarian: négyszer annyi/akkora, négyszeres (hu)
• Latin: quadruplus, quadruplex (la)
• Plautdietsch: feafach
• Tagalog: makaapat
• Telugu: నాలుగింతలు (te) (nālugintalu)

comprised of four individual members

• Dutch: vierledig, vierdelig (nl)
• Hindi: चौघरा (hi) (caughrā), चहुरा (hi) (cahurā), पाव (hi) (pāv)
• Hungarian: négyrészes, négyes (hu), négyrétű
• Swedish: fyrfaldig (sv)

Adverb

fourfold (not comparable)

1. By a factor of four.
   • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, 2 Samuel 12:6:

     And he shall restore the Lambe fourefold, because he did this thing, and because he had no pittie.

Synonyms

• quadruply; see also Thesaurus:four times

Translations

by a factor of four

• Bulgarian: четирикратно (bg) (četirikratno), четворно (bg) (četvorno)
• Czech: čtyřnásobně
• Finnish: nelinkertaisesti
• Hindi: चहुरा (hi) m (cahurā), चौघरा (hi) m (caughrā), पाव (hi) m (pāv), चौगुना (hi) (caugunā)
• Hungarian: négyszeresen, négyszeresére

Verb

fourfold (third-person singular simple present fourfolds, present participle fourfolding, simple past and past participle fourfolded)

1. To increase to four times as much; to multiply by four.

Synonyms

• quadruple, quadruplicate

Translations

increase to four times as much — see also quadruple

• Catalan: quadruplicar (ca)
• Dutch: verviervoudigen
• Finnish: nelinkertaistaa
• French: quadrupler (fr)
• German: vervierfachen (de), vierfachen (de)
• Hindi: चौगुना करना (caugunā karnā)
• Italian: quadruplicare (it)
• Portuguese: quadruplicar (pt)
• Russian: учетверять (ru) (učetverjatʹ)
• Spanish: cuadruplicar (es)
• Swedish: fyrdubbla (sv), fyrfaldiga (sv)

Noun

fourfold (plural fourfolds)

1. (mathematics) An algebraic variety of degree 4.
   • 2015, Brent Pym, “Elliptic singularities on log symplectic manifolds and Feigin--Odesskii Poisson brackets”, in arXiv‎^[2]:

     Our main application is to the classification of Poisson brackets on Fano fourfolds.