Sobriety

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late Middle English: from Old French sobriete or Latin sobrietas, from sobrius (see sober).

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From Old French sobriete, from Latin sobrietas.

etymonline

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sobriety (n.)

c. 1400, "moderation in indulgence," from Old French sobriete "sobriety, moderation" (Modern French sobrieté) or directly from Latin sobrietatem (nominative sobrietas), from sobrius (see sober (adj.)). Meaning "steadiness, gravity" is recorded from 1540s.