Source : Webster's Revised Unabridged Dictionary (1913)

Mediate \Me"di*ate\, v. t.
   1. To effect by mediation or interposition; to bring about as
      a mediator, instrument, or means; as, to mediate a peace.

   2. To divide into two equal parts. [R.] --Holder.

Mediate \Me"di*ate\, a. [L. mediatus, p. p. of mediare, v. t.,
   to halve, v. i., to be in the middle. See {Mid}, and cf.
   {Moiety}.]
   1. Being between the two extremes; middle; interposed;
      intervening; intermediate. --Prior.

   2. Acting by means, or by an intervening cause or instrument;
      not direct or immediate; acting or suffering through an
      intervening agent or condition.

   3. Gained or effected by a medium or condition. --Bacon.

            An act of mediate knowledge is complex. --Sir W.
                                                  Hamilton.

Mediate \Me"di*ate\, v. i. [imp. & p. p. {Mediated}; p. pr. &
   vb. n. {Mediating}.] [LL. mediatus, p. p. of mediare to
   mediate. See {Mediate}, a.]
   1. To be in the middle, or between two; to intervene. [R.]

   2. To interpose between parties, as the equal friend of each,
      esp. for the purpose of effecting a reconciliation or
      agreement; as, to mediate between nations.

Source : WordNet®

mediate
     adj 1: acting through or dependent on an intervening agency; "the
            disease spread by mediate as well as direct contact"
            [ant: {immediate}]
     2: being neither at the beginning nor at the end in a series;
        "adolescence is an awkward in-between age"; "in a mediate
        position"; "the middle point on a line" [syn: {in-between},
         {middle}]

mediate
     v 1: act between parties with a view to reconciling differences;
          "He interceded in the family dispute"; "He mediated a
          settlement" [syn: {intercede}, {intermediate}, {liaise},
           {arbitrate}]
     2: occupy an intermediate or middle position or form a
        connecting link or stage between two others; "mediate
        between the old and the new"