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“grandiloquence” in Latin

The English word grandiloquence itself goes back to Latin grandis, through grandiloquentia.

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

grandiloquence
magniloquentia (in Cic., not in a contemptuous sense; e.g., hexametrorum, Homeri; in Livy, of boastful grandiloquence, 44, 15. ☞ Not grandiloquentia, which Wyttenbach uses): granditas verborum (Cic., but not in a contemptuous sense): genus dicendi, quod tumore immodico turgescit (Quint., 12, 10, 73): tumidior sermo (Liv.).

Quick answer

What is the Latin word for grandiloquence?
The usual Latin words for “grandiloquence” are magniloquentia, hexameter, Homērus. 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.