Source : Webster's Revised Unabridged Dictionary (1913)

Depone \De*pone"\ (d[-e]*p[=o]n"), v. t. [imp. & p. p. {Deponed}
   (-p[=o]nd"); p. pr. & vb. n. {Deponing}.] [L. deponere,
   depositum, to put down, in LL., to assert under oath; de- +
   ponere to put, place. See {Position}, and cf. {Deposit}.]
   1. To lay, as a stake; to wager. [Obs.] --Hudibras.

   2. To lay down. [R.] --Southey.

   3. To assert under oath; to depose. [A Scotticism]

            Sprot deponeth that he entered himself thereafter in
            conference.                           --State
                                                  Trials(1606).