LATIN DICTIONARYLexicon Latīnum
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“fluctuation” in Latin

The English word fluctuation itself goes back to Latin flūctus, through fluctuatiōnem.

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

fluctuation
fluctuatio (PROP. and IMPROP.; rare; not prae-Augustan; animorum, Liv.): immutatio (change; SYN. in CHANGE): vicissitudo (regular alternation): varietas (variety; e.g., of weather, caeli). Fluctuation of opinion, fluctuatio animorum (irresolution); the battle continued for a long time with many fluctuations of success, diu anceps stetit victoria: a fluctuation between fear and hope, anceps spes et metus (Liv. 30, 32).

Quick answer

What is the Latin word for fluctuation?
The usual Latin words for “fluctuation” are flūctuātiō, immūtātiō, vicissitūdō; also varietās, animus, caelum. 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.