SLA see Service Level Agreement.
PROXY is a person authorized to act for another, e.g. a power of attorney document given by shareholders of a corporation authorizing a specific vote on their behalf at a corporate meeting.
ANNUITY, in finance, is a series of fixed payments, usually over a fixed number of years; or for the lifetime of a person, in which case it would be called a life-contingent annuity or simply life annuity.
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