LATIN DICTIONARYLexicon Latīnum
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“amplify” in Latin

The English word amplify itself goes back to Latin amplus, through amplificāre.

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

amplify
amplificare (= “enlarge,” and also “set off by rhetorical exaggeration”). Also dilatare (alicujus imperium, gloriam): propagare or proferre (aliquid, fines alicujus rei, etc.); augere: multiplicare. Vid. ENLARGE, INCREASE.
Exaggerate rhetorically, amplificare: verbis exaggerare: multiplicare verbis (represent as more numerous than they really are; e.g., copias): verbis augere: in majus (verbis) extollere: in falsum augere (Tac.).

Quick answer

What is the Latin word for amplify?
The usual Latin words for “amplify” are amplificō, dīlātō, glōria; also prō̆pāgō, prōferō, augeō. 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.