sigma

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix).

"Have you any theory about the Sigma ray itself?" — In Jeopardy, Van Tassel Sutphen
“Is the Chi Delta Sigma convention over?” she asked. — I am a woman, Ann Bannon
An inverted sigma dotted all round points out passages which may be taken in a double sense, and transpositions of words. — The Lives and Opinions of Eminent Philosophers, Diogenes Laertius

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