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Definition of assure

assure

/əˈʃʊr/
as · sure

Adverb:assuredly
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Adjective:assured
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Past Simple:assured
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Past Participle:assured
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Present Participle:assuring
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assure Lexical Profile

assure Game Scores & Validity

• verb

1

To tell someone positively or confidently in order to dispel any doubts they may have.

Example

"The pilot spoke over the intercom to assure the passengers that the turbulence would soon pass."


2

To make something certain to happen or be achieved.

Example

"Her groundbreaking research and dedication will assure her a prominent place in medical history."


3

British To provide insurance coverage for a person's life against the certainty of death or an agreed-upon maturity date.

Example

"The policy was taken out to assure his life for the financial security of his family."

Synonyms
View all synonyms for assure
Antonyms
View all antonyms for assure

Word Nuance & Usage

Often confused with 'ensure' and 'insure': 'assure' takes a personal direct object to mean removing someone's doubts ("I assure you"), 'ensure' means to make certain an event or outcome happens, and 'insure' refers specifically to financial protection against loss.

• Rhymes for assure

Word Origin & Etymology

Borrowed from Old French 'asseurer', from Vulgar Latin '*assecurare', formed from 'ad-' (to) and 'securus' (safe, secure).

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Assure. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/assure
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