verb (used with object), en·sured, en·sur·ing.

  1. to secure or guarantee: This letter will ensure you a hearing.
  2. to make sure or certain: measures to ensure the success of an undertaking.
  3. to make secure or safe, as from harm.
  4. insure(defs 1–3).

verb (tr)

  1. (may take a clause as object) to make certain or sure; guaranteethis victory will ensure his happiness
  2. to make safe or secure; protect

late 14c., from Anglo-French enseurer, from en- “make” (see en- (1)) + Old French seur “sure” (see sure); probably influenced by Old French asseurer “assure.” Related: Ensured; ensures; ensuring.

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