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“decorum” in Latin

The English word decorum itself goes back to Latin decor, through decōrum.

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

decorum
decorum (τὸ πρέπον; for which Quintilian, uses decor): to observe decorum, decorum sequi, or servare, or custodire: to observe decorum in anything, in aliqua re, quid deceat, considerare, or videre: to have a sense of decorum, quid deceat, sentire: anything is against decorum, turpe est aliquid: it was not, then, inconsistent with decorum, decorum erat tum (with infinitive, Liv.). With decorum, decore: non indecore.

Quick answer

What is the Latin word for decorum?
The usual Latin words for “decorum” are decus, servō, custōdiō; also cōnsīderō, videō, sentiō. 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.