LATIN DICTIONARYLexicon Latīnum
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“significant” in Latin

The English word significant itself goes back to Latin signum, through significans.

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

significant
significans (of words, etc.): efficiens (of words; Vid: Quint., 10, 1, 6): argutus (expressive of a person’s air, mien, etc.); or by circumlocution with words under SIGNIFY also, EXPRESSIVE.

Quick answer

What is the Latin word for significant?
The usual Latin words for “significant” are significō, efficiō, arguō. 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.