assure

If you assure your boss that you’ll finish your project by Tuesday, you are make a promise or commitment to have it done by Tuesday.

The verbs insure and ensure look and sound like assure but they aren't synonyms. There is some overlap in meaning — all of them can mean “to make secure or certain” — but assure is generally used in situations when you are referring to a person: “I assure you that I haven’t forgotten about driving you to the airport” or “He called his mother to assure her that everything will be fine.”

Definitions of assure
  1. verb
    inform positively and with certainty and confidence
    synonyms: tell
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    type of:
    affirm, assert, aver, avow, swan, swear, verify
    to declare or affirm solemnly and formally as true
  2. verb
    assure somebody of the truth of something with the intention of giving the listener confidence
    “I assured him that traveling to Cambodia was safe”
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    types:
    reassure
    give or restore confidence in; cause to feel sure or certain
    type of:
    persuade
    cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm
  3. verb
    cause to feel sure; give reassurance to
    synonyms: reassure
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    Antonyms:
    vex, worry
    disturb the peace of mind of; afflict with mental agitation or distress
    worry
    be worried, concerned, anxious, troubled, or uneasy
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    type of:
    calm, calm down, lull, quiet, quieten, still, tranquilize, tranquillise, tranquillize
    make calm or still
  4. verb
    be careful or certain to do something; make certain of something
    synonyms: ascertain, check, control, ensure, insure, see, see to it
    check, check off, mark, mark off, tick, tick off
    put a check mark on or near or next to
    check
    verify by consulting a source or authority
    ascertain, check, determine, find out, learn, see, watch
    find out, learn, or determine with certainty, usually by making an inquiry or other effort
    control, verify
    check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard
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    types:
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    proof, proofread
    read for errors
    control
    verify by using a duplicate register for comparison
    double-check
    check once more to be absolutely sure
    cross-check
    check out conflicting sources; crosscheck facts, for example
    cinch
    make sure of
    card
    ask someone for identification to determine whether he or she is old enough to consume liquor
    spot-check
    pick out random samples for examination in order to ensure high quality
    cover
    maintain a check on; especially by patrolling
    type of:
    verify
    confirm the truth of
  5. verb
    make certain of
    synonyms: ensure, guarantee, insure, secure
    guarantee, vouch
    give surety or assume responsibility
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    types:
    doom
    make certain of the failure or destruction of
    make
    assure the success of
  6. verb
    make a promise or commitment
    synonyms: promise
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    types:
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    pledge, plight
    promise solemnly and formally
    swear off
    promise to abstain from
    contract, undertake
    enter into a contractual arrangement
    guarantee, undertake
    promise to do or accomplish
    vow
    make a vow; promise
    stipulate
    make an oral contract or agreement in the verbal form of question and answer that is necessary to give it legal force
    sign
    be engaged by a written agreement
    subvent, subvention, underwrite
    guarantee financial support of
    guarantee, vouch
    give surety or assume responsibility
    condition, qualify, specify, stipulate
    specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
    covenant
    enter into a covenant or formal agreement
    lease, rent
    let for money
    charter, hire, lease, rent
    hold under a lease or rental agreement; of goods and services
    covenant
    enter into a covenant
    type of:
    declare
    state emphatically and authoritatively
Commonly confused words

assure / ensure / insure

Although these three often show up at the same party, giving hugs, they’re not the same, thank you very much. To assure is to tell someone everything’s ok, to ensure is to make certain, and to insure is to protect financially. Have it straight now? Are you sure?

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