LATIN DICTIONARYLexicon Latīnum
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“seventy” in Latin

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

seventy
septuaginta: (with a substantive that is used only in the plur.) septuageni: (distributive) septuageni: a man seventy years old, homo septuaginta annorum; septuaginta annos natus (Cic.); septuagenarius (Pand.): Seventy times, septuagies

Quick answer

What is the Latin word for seventy?
The usual Latin words for “seventy” are septuāgintā, septŭāgēni, septuāgēnārius; also septuāgiēs. 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.