The Collaborative International Dictionary of English v.0.48:

Depose \De*pose"\, v. i.
   To bear witness; to testify under oath; to make deposition.
   [1913 Webster]

         Then, seeing't was he that made you to despose,
         Your oath, my lord, is vain and frivolous. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Depose \De*pose"\, v. t. [imp. & p. p. Deposed; p. pr. & vb.
   n. Deposing.][FF. d['e]poser, in the sense of L. deponere
   to put down; but from pref. d['e]- (L. de) + poser to place.
   See Pose, Pause.]
   1. To lay down; to divest one's self of; to lay aside. [Obs.]
      [1913 Webster]

            Thus when the state one Edward did depose,
            A greater Edward in his room arose.   --Dryden.
      [1913 Webster]

   2. To let fall; to deposit. [Obs.]
      [1913 Webster]

            Additional mud deposed upon it.       --Woodward.
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   3. To remove from a throne or other high station; to
      dethrone; to divest or deprive of office.
      [1913 Webster]

            A tyrant over his subjects, and therefore worthy to
            be deposed.                           --Prynne.
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   4. To testify under oath; to bear testimony to; -- now
      usually said of bearing testimony which is officially
      written down for future use. --Abbott.
      [1913 Webster]

            To depose the yearly rent or valuation of lands.
                                                  --Bacon.
      [1913 Webster]

   5. To put under oath. [Obs.]
      [1913 Webster]

            Depose him in the justice of his cause. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

depose
    v 1: force to leave (an office) [syn: depose, force out]
    2: make a deposition; declare under oath [syn: swear,
       depose, depone]

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "depose":
   acknowledge, affirm, allege, and candle, assert under oath,
   asseverate, assure, attest, aver, avouch, avow, bank, bear witness,
   book, boot, bounce, break, buck off, bump, bust, can, cashier,
   certify, chuck, declare, deconsecrate, defrock, degrade, demote,
   deplume, depone, deposit, deprive, deracinate, dethrone, disbar,
   discharge, disclose, discrown, disemploy, disenthrone, dislodge,
   dismiss, dismount, displace, displume, drum out, eject,
   excommunicate, expel, fire, furlough, give evidence, give the ax,
   give the gate, guarantee, kick, kick upstairs, kiss the book,
   lay off, let go, let out, liquidate, make redundant, mount, oust,
   overthrow, pension, pension off, predicate, profess, protest,
   purge, put by, read out of, release, remove, remove from office,
   replace, retire, root out, root up, sack, separate forcibly, store,
   stow, strip, strip of office, strip of rank, subvert, superannuate,
   surplus, suspend, swear, swear by bell, swear the truth, swear to,
   swear to God, swear to goodness, testify, throw off, throw out,
   turn off, turn out, unchurch, uncrown, unfrock, unhorse, unmake,
   unplace, unsaddle, unseat, unthrone, uproot, upset, vouch, vow,
   warrant, witness