[en-shoor, -shur]
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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).

Origin of ensure

1350–1400; Middle English ensuren < Anglo-French enseurer. See en-1, sure
Related formsen·sur·er, nounun·en·sured, adjective

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ensure


esp US insure

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
Derived Formsensurer, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ensure

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.

Online Etymology Dictionary, © 2010 Douglas Harper