Synonyms for ensure

Most common

secure · determine · assure · insure

All synonyms

Verb

Antonyms

obviate

All antonyms of ensure →

Definitions

1. v. 1

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

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

Forms

Past participle

ensured
e.g. ensured → assured, determined, secured, insured…

Example sentences

• secure The fortress was secure from every kind of attack.
• determine The doctors couldn't determine the cause of death.
• assure I want to assure you that we've not forgotten you.
• insure Yanni has to insure his life for his family.

Popularity over time

Use in printed books, per decade from 1850 to 2019.

By length

3 letters

see¹, fix¹

5 letters

check¹

6 letters

secure², assure², insure²

7 letters

control²

9 letters

determine³, guarantee³, ascertain³

The small number after each word is its number of syllables (secure² = 2 syllables).