Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To make sure or certain; insure: Our precautions ensured our safety. See Usage Note at assure.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To make sure. See insure.
  • transitive v. To betroth.

from The Century Dictionary and Cyclopedia

  • See insure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. be careful or certain to do something; make certain of something
  • v. make certain of

Etymologies

Middle English ensuren, from Anglo-Norman enseurer : Old French en-, causative pref.; see en-1 + Old French seur, secure, variant of sur; see sure.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Anglo-Norman enseurer, from Old French seur ("sure"). (Wiktionary)

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