LATIN DICTIONARYLexicon Latīnum
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“fifth” in Latin

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

fifth
quintus. Each fifth (man), quintus quisque: every fifth month (e.g., he goes on a journey), quinto quoque mense: the fifth day of or after the Ides, quinquatrus: one of the fifth rank, quintarius: one of the fifth legion, quintanus: for the fifth time, quintum: what occurs on the fifth day, quintanus (e.g., on the fifth day of the month, as the Nonae): at every fifth pole, quintanis (sc. vicibus; of planting vines, Plin.): the fifth book of Moses, Deuteronomium (Eccl.): a fifth part, pars quinta: ☞ quincunx is five-twelfths: three-fifths; e.g., of an hour, quintae partes horae tres (Plin., 6, 34, 39): happening every fifth year, quinquennalis.

Quick answer

What is the Latin word for fifth?
The usual Latin words for “fifth” are Quīnquātrūs, quintārĭus, quintānus; also quīntus, quīntāna, deuteronomium. 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.