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[en-shoo r, -shur] /ɛnˈʃʊər, -ˈʃɜr/
verb (used with object), ensured, ensuring.
to secure or guarantee:
This letter will ensure you a hearing.
to make sure or certain:
measures to ensure the success of an undertaking.
to make secure or safe, as from harm.
insure (defs 1–3).
Origin of ensure
1350-1400; Middle English ensuren < Anglo-French enseurer. See en-1, sure
Related forms
ensurer, noun
unensured, adjective
3. protect, guard, safeguard. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for ensure
Contemporary Examples
Historical Examples
  • To ensure a fair measure of comfort, therefore, I took with me some tinned provisions, to be broached as necessity demanded.

  • The success no man can ensure; but for the fighting them, if they can be got at, I pledge myself.

  • To share the destiny of such a man was to ensure a life that could not pass unrecorded.

    Lord Kilgobbin Charles Lever
  • He had resolved to ensure his silence; and he looked to the end, not the means.

  • This will ensure a good head of water, and make the douche a formidable affair.

    The Turkish Bath Robert Owen Allsop
British Dictionary definitions for ensure


/ɛnˈʃʊə; -ˈʃɔː/
verb (transitive)
(may take a clause as object) to make certain or sure; guarantee: this victory will ensure his happiness
to make safe or secure; protect
Derived Forms
ensurer, 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
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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
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