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Alternative forms[edit]


From Proto-Italic *jakjō (throw (down?)), from Proto-Indo-European *(H)yeh₁- (to throw, let go). Compare iaceō.

Cognate with Ancient Greek ἵημι (híēmi, to send, throw).



iaciō (present infinitive iacere, perfect active iēcī, supine iactum); third conjugation iō-variant

  1. I throw, hurl, cast, fling; throw away.
    Synonyms: coniciō, iniciō, adiciō, obiciō, abiciō, iaculor, iactō, trāiciō, impingō, ēmittō, mittō, permittō, lībrō
    Alea iacta est.The die has been cast.(Caesar)
  2. I lay, set, establish, build, found, construct, erect.
    fundamenta iacereto lay the foundations/groundwork
  3. I send forth, emit; bring forth, produce.
    Synonyms: ēmittō, prōdō, ēdō, effundō, mittō
  4. I scatter, sow, throw.
  5. (as a shadow) I project.
  6. (figuratively) I throw out in speaking, let fall, utter, mention, declare.


   Conjugation of iaciō (third conjugation -variant)
indicative singular plural
first second third first second third
active present iaciō iacis iacit iacimus iacitis iaciunt
imperfect iaciēbam iaciēbās iaciēbat iaciēbāmus iaciēbātis iaciēbant
future iaciam iaciēs iaciet iaciēmus iaciētis iacient
perfect iēcī iēcistī iēcit iēcimus iēcistis iēcērunt,
pluperfect iēceram iēcerās iēcerat iēcerāmus iēcerātis iēcerant
future perfect iēcerō iēceris iēcerit iēcerimus iēceritis iēcerint
passive present iacior iaceris,
iacitur iacimur iaciminī iaciuntur
imperfect iaciēbar iaciēbāris,
iaciēbātur iaciēbāmur iaciēbāminī iaciēbantur
future iaciar iaciēris,
iaciētur iaciēmur iaciēminī iacientur
perfect iactus + present active indicative of sum
pluperfect iactus + imperfect active indicative of sum
future perfect iactus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present iaciam iaciās iaciat iaciāmus iaciātis iaciant
imperfect iacerem iacerēs iaceret iacerēmus iacerētis iacerent
perfect iēcerim iēcerīs iēcerit iēcerīmus iēcerītis iēcerint
pluperfect iēcissem iēcissēs iēcisset iēcissēmus iēcissētis iēcissent
passive present iaciar iaciāris,
iaciātur iaciāmur iaciāminī iaciantur
imperfect iacerer iacerēris,
iacerētur iacerēmur iacerēminī iacerentur
perfect iactus + present active subjunctive of sum
pluperfect iactus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present iace iacite
future iacitō iacitō iacitōte iaciuntō
passive present iacere iaciminī
future iacitor iacitor iaciuntor
non-finite forms active passive
present perfect future present perfect future
infinitives iacere iēcisse iactūrum esse iacī iactum esse iactum īrī
participles iaciēns iactūrus iactus iaciendus,
verbal nouns gerund supine
genitive dative accusative ablative accusative ablative
iaciendī iaciendō iaciendum iaciendō iactum iactū

Derived terms[edit]

Related terms[edit]


  • iacio”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • iacio 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 be broken down by misfortune: in malis iacere
    • (ambiguous) to let fall an expression: voces iacere (Sall. Iug. 11)
    • (ambiguous) to use threats: minas iacere, iactare
    • (ambiguous) to lay the foundations: fundamenta iacere, agere
    • (ambiguous) to discharge missiles: tela iacere, conicere, mittere
    • (ambiguous) to be out of range: extra teli iactum, coniectum esse
    • (ambiguous) to raise a rampart, earthwork: vallum iacere, exstruere, facere
    • (ambiguous) to drop anchor: ancoras iacere

Further reading[edit]

  • jacio”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7)‎[2], Leiden, Boston: Brill, →ISBN