Etymology

certify

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Today it means: To attest to (a fact) as the truth. Full definition →

Old French certefier
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The story

  1. Old French · derived fromcertefier“confirm, assure, make certain”
  2. English todaycertify

From Old French certefier (“confirm, assure, make certain”). Compare French certifier.

Etymology from Wiktionary, CC BY-SA 4.0.