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From ob- (before) +‎ sedeō (I sit).





obsideō (present infinitive obsidēre, perfect active obsēdī, supine obsessum); second conjugation

  1. to sit, remain, abide, stay
    Synonyms: habitō, cōnsīdō, possideō, iaceō, resideō, subsīdō, incolō, colō, stabulō, vīvō, versō
  2. to frequent, haunt, inhabit
  3. (transitive, military) to besiege; hem in, beset, invest, blockade a place
    Synonyms: obsīdō, circumveniō, circumeō, circumsistō, circumdō, claudō, assideō, circumsaepiō, obstruō, saepiō
    • 27 BCE – 25 BCE, Titus Livius, Ab Urbe Condita 26.1:
      Q. Fuluio Ap. Claudio, prioris anni consulibus, prorogatum imperium est atque exercitus quos habebant decreti, adiectumque ne a Capua quam obsidebant abscederent priusquam expugnassent.
      The military authority of Quintus Fulvius and Appius Claudius, consuls of the previous year, was extended and the armies which they had were decided upon, and it was added as a proviso that they should not withdraw from Capua, which they were besieging, until they conquered it.
    • Late 4th century, Jerome [et al.], transl., edited by Roger Gryson, Biblia Sacra: Iuxta Vulgatam Versionem (Vulgate), 5th edition, Stuttgart: Deutsche Bibelgesellschaft, published 2007, →ISBN, Danihelis 1:1:
      anno tertio regni Ioachim regis Iuda venit Nabuchodonosor rex Babylonis Hierusalem et obsedit eam
      In the third year of the reign of Jehoiakim king of Judah came Nebuchadnezzar king of Babylon unto Jerusalem, and besieged it.
  4. (transitive) to detain, hold captive
  5. to occupy, fill, possess
    Synonyms: obtineō, possideō, compleō, adipīscor, apprehendō, teneo, comprehendo, occupō, capio
  6. to watch closely; to be on the lookout for


   Conjugation of obsideō (second conjugation)
indicative singular plural
first second third first second third
active present obsideō obsidēs obsidet obsidēmus obsidētis obsident
imperfect obsidēbam obsidēbās obsidēbat obsidēbāmus obsidēbātis obsidēbant
future obsidēbō obsidēbis obsidēbit obsidēbimus obsidēbitis obsidēbunt
perfect obsēdī obsēdistī obsēdit obsēdimus obsēdistis obsēdērunt,
pluperfect obsēderam obsēderās obsēderat obsēderāmus obsēderātis obsēderant
future perfect obsēderō obsēderis obsēderit obsēderimus obsēderitis obsēderint
passive present obsideor obsidēris,
obsidētur obsidēmur obsidēminī obsidentur
imperfect obsidēbar obsidēbāris,
obsidēbātur obsidēbāmur obsidēbāminī obsidēbantur
future obsidēbor obsidēberis,
obsidēbitur obsidēbimur obsidēbiminī obsidēbuntur
perfect obsessus + present active indicative of sum
pluperfect obsessus + imperfect active indicative of sum
future perfect obsessus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present obsideam obsideās obsideat obsideāmus obsideātis obsideant
imperfect obsidērem obsidērēs obsidēret obsidērēmus obsidērētis obsidērent
perfect obsēderim obsēderīs obsēderit obsēderīmus obsēderītis obsēderint
pluperfect obsēdissem obsēdissēs obsēdisset obsēdissēmus obsēdissētis obsēdissent
passive present obsidear obsideāris,
obsideātur obsideāmur obsideāminī obsideantur
imperfect obsidērer obsidērēris,
obsidērētur obsidērēmur obsidērēminī obsidērentur
perfect obsessus + present active subjunctive of sum
pluperfect obsessus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present obsidē obsidēte
future obsidētō obsidētō obsidētōte obsidentō
passive present obsidēre obsidēminī
future obsidētor obsidētor obsidentor
non-finite forms active passive
present perfect future present perfect future
infinitives obsidēre obsēdisse obsessūrum esse obsidērī obsessum esse obsessum īrī
participles obsidēns obsessūrus obsessus obsidendus
verbal nouns gerund supine
genitive dative accusative ablative accusative ablative
obsidendī obsidendō obsidendum obsidendō obsessum obsessū

Derived terms



  • English: obsess
  • French: obséder
  • Italian: ossedere
  • Spanish: obseder
  • Romanian: obseda
  • Portuguese: obsediar


  • obsideo”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • obsideo”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • obsideo in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • (ambiguous) to besiege a city: oppidum obsidere
    • (ambiguous) to give hostages: obsides dare
    • (ambiguous) to compel communities to provide hostages: obsides civitatibus imperare