Etymology

promissory

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Today it means: Containing or consisting of a promise. Full definition →

Middle English promissorye ← Medieval Latin prōmissōrius
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The story

  1. Medieval Latin · derived fromprōmissōrius
  2. Middle English · inherited frompromissorye
  3. English todaypromissory

From Middle English promissorye, from Medieval Latin prōmissōrius. By surface analysis, promise + -ory.

Etymology from Wiktionary, CC BY-SA 4.0.