An assurance is a vote of confidence. If you give your friend an assurance that you'll be there, you'd better show up.

If you pledge to do something or make a binding commitment to do it, you can use the noun assurance. If the bank is going to loan you money to buy a house, they are going to need some sort of assurance that you will repay the loan in a timely manner. If you have confidence in yourself and your abilities, you can also use assurance to describe that — "The baseball team played with assurance, quickly racking up a seven point lead."

Definitions of assurance
  1. noun
    a binding commitment to do or give or refrain from something
    “an assurance of help when needed”
    synonyms: pledge
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    guarantee, warrant, warrantee, warranty
    a written assurance that some product or service will be provided or will meet certain specifications
    an unconditional commitment that something will happen or that something is true
    plight, troth
    a solemn pledge of fidelity
    a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner
    security, surety
    a guarantee that an obligation will be met
    a payment given as a guarantee that an obligation will be met
    stock warrant
    a written certificate that gives the holder the right to purchase shares of a stock for a specified price within a specified period of time
    safety net
    a guarantee of professional or financial security
    full faith and credit
    a guarantee to pay interest and principal on debt; usually issued by the United States Treasury
    type of:
    commitment, dedication
    a message that makes a pledge
  2. noun
    a statement intended to inspire confidence
    “the President's assurances were not respected”
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    clean bill of health
    an assurance that someone is healthy or something is in good condition
    type of:
    a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc
  3. noun
    freedom from doubt; belief in yourself and your abilities
    “his assurance in his superiority did not make him popular”
    synonyms: authority, confidence, self-assurance, self-confidence, sureness
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    type of:
    the state of being certain
  4. noun
    a British term for some kinds of insurance
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    type of:
    promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made prepayments to an insurance company
Word Family

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