1560s, "one who deposes" (obsolete in this sense); 1620s, "one who makes a deposit, one who places something in charge of another," agent noun in Latin form from deposit (v.).
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deposit v.
1620s, "place in the hands of another as a pledge for a contract," from Latin depositus, past participle of deponere "lay aside, put down, deposit," also used of births and bets, from de "away" (see de-) + ponere "to put, place" (past participle positus; see position (n.)). From 1650s as "lay away for safe-keeping;" from 1749 as "lay down, place, put." Related: Deposited; depositing.