LATIN DICTIONARYLexicon Latīnum
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“extempore” in Latin

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

extempore adj.
and adverb, subitus, or subitus et fortuitus, with substantives (☞ for which we find extemporalis in the Silver Age), or by subito, ex tempore, with verbs: an extempore speech, oratio subita et fortuita (opposed to commentatio et cogitatio): readiness at extempore speaking, ex tempore dicendi facultas (☞ extemporalis facultas, extemporalitas, post-Augustan, Suet.): to speak extempore, subito or ex tempore dicere (opposed to parate atque cogitate dicere): to compose verses extempore (or impromptu), ex tempore versus fundere, or poemata facere: an extempore (or impromptu) poet, in fingendis poematibus (or carminibus) promptus et facilis ad extemporalitatem usque (Suet., Tit., 3).

Quick answer

What is the Latin word for extempore?
The usual Latin words for “extempore” are subeō, extemporālitas. 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.