What is the Latin word for thirty?

The usual Latin words for “thirty” are trīgintā, trīcēni, trīcennium; also trīcēnārius, trīciēs. The right choice depends on the sense; see the distinctions below.

English → Latin

“thirty” in Latin

trīgintāthirty; 30 trīcēnithirty at a time trīcenniumtricennium, a thrity-year period trīcēnāriusthirty trīciēsthirty times

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

thirty

triginta: (distributive) triceni, -ae, -a (used also for “thirty” with substantives which have no sing.). A space of thirty years, tricennium (Codex Justinianus., 7, 31); triginta anni: the males attain at the most to the age of thirty years, vita maribus tricenis annis longissima: thirty years of age, tricenarius; triginta annorum: that lasts thirty years, triginta annorum: thirty times, tricies; trigesies: thirty times as large, as small, etc., *triginta partibus major, minor, etc.: months of thirty days, cavi menses (opposed to pleni menses, those of thirty-one, Censorin., 20).

Quick answer

What is the Latin word for thirty?: The usual Latin words for “thirty” are trīgintā, trīcēni, trīcennium; also trīcēnārius, trīciēs. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.