assideo

Latin

Etymology tree

Proto-Indo-European *h₂éd

Proto-Italic *ad

Latin ad

Latin ad-

Proto-Indo-European *sed-éh₁-ye-ti

Proto-Italic *sedēō

Latin sedeō

Latin assideo

From ad- (“to, towards, at”) +‎ sedeō (“sit; settle down”).

assideō (present infinitive assidēre, perfect active assēdī, supine assessum); second conjugation, no passive

to sit by or near someone or something
to be or stand by one's side
(of the sick) to take care of, attend upon or to
(figuratively) to station oneself before, be encamped before or sit down before (something); besiege, blockade
Synonyms: circumveniō, circumdō, obsideō, claudō, obstruō
(figuratively, with dative) to be like, resemble

Conjugation of assideō (second conjugation, active only)
indicative		singular			plural
indicative		first	second	third	first	second	third
active	present	assideō	assidēs	assidet	assidēmus	assidētis	assident
	imperfect	assidēbam	assidēbās	assidēbat	assidēbāmus	assidēbātis	assidēbant
	future	assidēbō	assidēbis	assidēbit	assidēbimus	assidēbitis	assidēbunt
	perfect	assēdī	assēdistī	assēdit	assēdimus	assēdistis	assēdērunt, assēdēre
	pluperfect	assēderam	assēderās	assēderat	assēderāmus	assēderātis	assēderant
	future perfect	assēderō	assēderis	assēderit	assēderimus	assēderitis	assēderint
subjunctive		singular			plural
subjunctive		first	second	third	first	second	third
active	present	assideam	assideās	assideat	assideāmus	assideātis	assideant
	imperfect	assidērem	assidērēs	assidēret	assidērēmus	assidērētis	assidērent
	perfect	assēderim	assēderīs	assēderit	assēderīmus	assēderītis	assēderint
	pluperfect	assēdissem	assēdissēs	assēdisset	assēdissēmus	assēdissētis	assēdissent
imperative		singular			plural
imperative		first	second	third	first	second	third
active	present	—	assidē	—	—	assidēte	—
active	future	—	assidētō	assidētō	—	assidētōte	assidentō
non-finite forms		active			passive
non-finite forms		present	perfect	future	present	perfect	future
infinitives		assidēre	assēdisse	assessūrum esse	—	—	—
participles		assidēns	—	assessūrus	—	—	—
verbal nouns		gerund				supine
		genitive	dative	accusative	ablative	accusative	ablative
		assidendī	assidendō	assidendum	assidendō	assessum	assessū

Balkan Romance:
- Romanian: așeza
Italo-Romance:
- Italian: assidere (obsolete)
- Neapolitan: assittà
Northern Gallo-Romance;
- Champaignat: assire
- French: asseoir
Southern Gallo-Romance:
- Catalan: asseure
- Occitan:
  Gascon: asseder, assedre, asseser, asseider
  
  Languedocien: asseire
  
  Vivaro-Alpine: asseire
Ibero-Romance:
- Spanish: asear
⇒ Latin: assessus
- Medieval Latin: assessare
  - Old French: assesser
    - → Middle English: assessen
      - English: assess

“assideo”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
assideo in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.