Irrevocable Beneficiary
A beneficiary in a life insurance policy or segregated fund contract whose compensation cannot be changed without his or her consent.
Investopedia Commentary
For example, if a parent wanted to leave money to a child, the parent could designate that child as an irrevocable beneficiary, thus ensuring the child will receive the compensation of the life insurance policy or the segregated fund contract.
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See also: Beneficiary, Life Insurance, Segregated Fund