LATIN DICTIONARYLexicon Latīnum
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“seven” in Latin

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

seven
septem: septeni, -ae, -a (distributively; also = seven at once; especially with substantives that are only used in the plur.; e.g., boys of seven years, pueri septenum annorum: seven letters, epistles, litterae septenae; not litterae septem: i. e., seven letters of the alphabet): consisting of seven, septenarius (e.g., numerus = number seven; versus = consisting of seven members; fistula = a tube which measures seven feet in diameter): seven feet long, large, etc., septempedalis: seven-twelfth parts of the whole, septunx (e.g., jugeri): lasting seven years, septennis: a course of seven dishes, synthesis septenaria (Mart., 4, 46, 15). A committee or commission of seven members, septemviri: anything relating to such a commission, septemviralis: a space of seven years, septem anni (septennium late): once in seven years, septimo quoque anno: seven and a half, septem et semis

Quick answer

What is the Latin word for seven?
The usual Latin words for “seven” are septem, septēni, septēnārius; also numerus, largus, septū̆nx. 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.