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Annuity as a term was derived from annus, a Latin word which can be said to be a vehicle of investment thats very similar to Certificate of Deposits that banks offer. In rather simple terms, income is annuity.
On a broader definition, annuity is a contract that guarantees a sequence of payments in exchange for a lump sum savings. Many people that buy annuities have it at the back of their minds that the annuities could turn out as source of income for them when they retire.
Finally, there are insurance agents that can tell you more about annuities before making the final decision.
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