LATIN DICTIONARYLexicon Latīnum
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“solemnize” in Latin

The English word solemnize itself goes back to Latin sollemnis, through solemnis.

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

solemnize
To celebrate, agere, agitare (the proper word, festivals, birthdays, holidays, etc.): celebrare (to assist by one’s presence in making a numerous assembly; e.g., birthday, marriage-feast: less frequently of a festival). To solemnize a day as a festival, diem prosequi (Nep., Att., 4, extr.). To solemnize a festival for three days, diem festum agere triduum or per triduum; public games, ludos facere or committere. To solemnize divine service, sacra procurare; sacris operari; res divinas rite perpetrare: but, in the modern sense, better *rebus divinis interesse (of the officiating minister).

Quick answer

What is the Latin word for solemnize?
The usual Latin words for “solemnize” are agō, agitō, celebrō; also committō. 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.