Ensure

//ɪnˈʃɔː(ɹ)// verb

verb ·Moderate ·College level

Definitions

Verb
  1. 1
    To make sure or certain of something (usually some future event or condition). intransitive

    "I use an alarm clock to ensure that I get up on time."

  2. 2
    be careful or certain to do something; make certain of something wordnet
  3. 3
    To make a pledge to (someone); to promise, guarantee (someone of something); to assure. obsolete, transitive

    "Thenne he cryed hym mercy and sayd Faire knyght for goddes loue slee me not / and I shall ensure the neuer werre ageynst thy lady / but be alwey toward her / Thenne Bors lete hym be"

  4. 4
    make certain of wordnet

Synonyms

All synonyms
guaranteearmarmorarrangeascertainascertain

Example

More examples

"This medicine will ensure you a good night's sleep."

Etymology

From Middle English ensuren, from Anglo-Norman enseurer, from Old French seur (“sure”). Doublet of insure.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.