ensure

 
Pronunciation: /ɪnˈʃɔː, -ˈʃʊə, ɛn-/

verb

[with object]
  • make certain that (something) will occur or be the case: [with clause]: the client must ensure that accurate records are kept
  • make certain of obtaining or providing (something): legislation to ensure equal opportunities for all
  • [no object] (ensure against) make sure that (a problem) does not occur: only by researching stocks thoroughly can a client ensure against being misled

Origin:

late Middle English (in the senses 'convince' and 'make safe'): from Anglo-Norman French enseurer, alteration of Old French aseurer, earlier form of assurer (see assure). Compare with insure

On the difference between ensure and insure, see insure (usage).