The Collaborative International Dictionary of English v.0.48:

Deposit \De*pos"it\, v. t. [imp. & p. p. Deposited; p. pr. &
   vb. n. Depositing.] [L. depositus, p. p. of deponere. See
   Depone, and cf. Deposit, n.]
   1. To lay down; to place; to put; to let fall or throw down
      (as sediment); as, a crocodile deposits her eggs in the
      sand; the waters deposited a rich alluvium.
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            The fear is deposited in conscience.  --Jer. Taylor.
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   2. To lay up or away for safe keeping; to put up; to store;
      as, to deposit goods in a warehouse.
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   3. To lodge in some one's hands for safe keeping; to commit
      to the custody of another; to intrust; esp., to place in a
      bank, as a sum of money subject to order.
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   4. To lay aside; to rid one's self of. [Obs.]
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            If what is written prove useful to you, to the
            depositing that which I can not but deem an error.
                                                  --Hammond.
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   Note: Both this verb and the noun following were formerly
         written deposite.
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The Collaborative International Dictionary of English v.0.48:

Deposit \De*pos"it\, n. [L. depositum, fr. depositus, p. p. of
   deponere: cf. F. d['e]p[^o]t, OF. depost. See Deposit, v.
   t., and cf. Depot.]
   1. That which is deposited, or laid or thrown down; as, a
      deposit in a flue; especially, matter precipitated from a
      solution (as the siliceous deposits of hot springs), or
      that which is mechanically deposited (as the mud, gravel,
      etc., deposits of a river).
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            The deposit already formed affording to the
            succeeding portion of the charged fluid a basis.
                                                  --Kirwan.
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   2. (Mining) A natural occurrence of a useful mineral under
      the conditions to invite exploitation. --Raymond.
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   3. That which is placed anywhere, or in any one's hands, for
      safe keeping; something intrusted to the care of another;
      esp., money lodged with a bank or banker, subject to
      order; anything given as pledge or security.
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   4. (Law)
      (a) A bailment of money or goods to be kept gratuitously
          for the bailor.
      (b) Money lodged with a party as earnest or security for
          the performance of a duty assumed by the person
          depositing.
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   5. A place of deposit; a depository. [R.]
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   Bank of deposit. See under Bank.

   In deposit, or On deposit, in trust or safe keeping as a
      deposit; as, coins were received on deposit.
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WordNet (r) 3.0 (2006):

deposit
    n 1: the phenomenon of sediment or gravel accumulating [syn:
         deposit, sedimentation, alluviation]
    2: matter that has been deposited by some natural process [syn:
       sediment, deposit]
    3: the natural process of laying down a deposit of something
       [syn: deposition, deposit]
    4: money deposited in a bank or some similar institution [syn:
       deposit, bank deposit]
    5: a partial payment made at the time of purchase; the balance
       to be paid later [syn: down payment, deposit]
    6: money given as security for an article acquired for temporary
       use; "his deposit was refunded when he returned the car"
    7: a payment given as a guarantee that an obligation will be met
    8: a facility where things can be deposited for storage or
       safekeeping [syn: depository, deposit, depositary,
       repository]
    9: the act of putting something somewhere [syn: deposit,
       deposition]
    v 1: put, fix, force, or implant; "lodge a bullet in the table";
         "stick your thumb in the crack" [syn: lodge, wedge,
         stick, deposit] [ant: dislodge, free]
    2: put into a bank account; "She deposits her paycheck every
       month" [syn: deposit, bank] [ant: draw, draw off,
       take out, withdraw]
    3: put (something somewhere) firmly; "She posited her hand on
       his shoulder"; "deposit the suitcase on the bench"; "fix your
       eyes on this spot" [syn: situate, fix, posit,
       deposit]