LATIN DICTIONARYLexicon Latīnum
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“decoration” in Latin

The English word decoration itself goes back to Latin decus, through decoratio.

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

decoration
ornatio; exornatio (as acts): as the ornaments themselves, cultus (taken collectively): ornatus; ornamentum (taken separately; e.g., of theatrical decoration): apparatus (the whole supply of objects with which to decorate anything): to change the decorations (of a theatre), mutare speciem ornationis (Vitrvius, 5, 6, 8).

Quick answer

What is the Latin word for decoration?
The usual Latin words for “decoration” are ornātĭo, exōrnātiō, colō; also ōrnō, ōrnāmentum, apparō. 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.