[ en-shoor, -shur ]
/ ɛnˈʃʊər, -ˈʃɜr /

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

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.

Origin of ensure

1350–1400; Middle English ensuren < Anglo-French enseurer. See en-1, sure
Related formsen·sur·er, nounun·en·sured, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ensure

British Dictionary definitions for ensure


esp US insure

/ (ɛnˈʃʊə, -ˈʃɔː) /

verb (tr)

(may take a clause as object) to make certain or sure; guaranteethis victory will ensure his happiness
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