septenary

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun the cardinal number that is the sum of six and one

Etymology

From Middle English septenarie, septenary, from Classical Latin septēnārius (“consisting of seven each”), from septēnus (“seven each; seven at a time”) + -ārius (whence the English suffix -ary). With use as noun compare septēnārius (“line of seven feet; unit of seven parts; period of seven years”). By surface analysis, septen- + -ary. Doublet of septenar and septenarius.

Synonyms

seven, 7, VII, sevener, heptad, septet

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