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From arbiter +‎ .





arbitror (present infinitive arbitrārī or arbitrārier, perfect active arbitrātus sum); first conjugation, deponent

  1. to judge, arbitrate
  2. to witness, observe
  3. to believe, think
    Synonyms: sentio, reor, existimo, cogito, opinor, iudico, censeo, considero
  4. to consider, be of the opinion
    Synonyms: considero, reputo, existimo, puto, pendo
  5. to examine, consider, weigh
    Synonyms: aspiciō, cōnsīderō, circumspiciō, reputō, exsequor


   Conjugation of arbitror (first conjugation, deponent)
indicative singular plural
first second third first second third
active present arbitror arbitrāris,
arbitrātur arbitrāmur arbitrāminī arbitrantur
imperfect arbitrābar arbitrābāris,
arbitrābātur arbitrābāmur arbitrābāminī arbitrābantur
future arbitrābor arbitrāberis,
arbitrābitur arbitrābimur arbitrābiminī arbitrābuntur
perfect arbitrātus + present active indicative of sum
pluperfect arbitrātus + imperfect active indicative of sum
future perfect arbitrātus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present arbitrer arbitrēris,
arbitrētur arbitrēmur arbitrēminī arbitrentur
imperfect arbitrārer arbitrārēris,
arbitrārētur arbitrārēmur arbitrārēminī arbitrārentur
perfect arbitrātus + present active subjunctive of sum
pluperfect arbitrātus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present arbitrāre arbitrāminī
future arbitrātor arbitrātor arbitrantor
non-finite forms active passive
present perfect future present perfect future
infinitives arbitrārī,
arbitrātum esse arbitrātūrum esse
participles arbitrāns arbitrātus arbitrātūrus arbitrandus
verbal nouns gerund supine
genitive dative accusative ablative accusative ablative
arbitrandī arbitrandō arbitrandum arbitrandō arbitrātum arbitrātū

1The present passive infinitive in -ier is a rare poetic form which is attested.




  • arbitror in Karl Ernst Georges, Ausführliches lateinisch-deutsches Handwörterbuch
  • arbitror”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • arbitror”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • arbitror in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to feel superior to the affairs of life: res humanas infra se positas arbitrari
    • to consider a thing beneath one's dignity: aliquid infra se ducere or infra se positum arbitrari
  • arbitror in Ramminger, Johann (2016 July 16 (last accessed)) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016