LATIN DICTIONARYLexicon Latīnum
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“commemorate” in Latin

The English word commemorate itself goes back to Latin memor, through commemorātus.

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

commemorate
to make mention of, [Vid: MENTION].
To celebrate, agere: agitare (the proper word; e.g., an event, the anniversary of anything, one’s birth-day, etc.): celebrare (with pomp or demonstrations of joy, by one’s presence; e.g., a birlh-day, a wedding, less frequently of feasts): to commemorate a day, diem prosequi (Vid: Nep., Att., 4, extr.): to commemorate anything by a feast for three days, diem festum agere triduum or per triduum.

Quick answer

What is the Latin word for commemorate?
The usual Latin words for “commemorate” are agō, agitō, celebrō. 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.