Source : Webster's Revised Unabridged Dictionary (1913)

Evacuate \E*vac"u*ate\, v. i.
   To let blood [Obs.] --Burton.

Evacuate \E*vac"u*ate\, v. t. [imp. & p. p. {Evacuated}; p. pr.
   & vb. n. {Evacuating}.] [l. evacuatus, p. p. of evacuare to
   empty, nullify; e out + vacuus empty, vacare to be empty. See
   {Vacate}.]
   1. To make empty; to empty out; to remove the contents of;
      as, to evacuate a vessel or dish.

   2. Fig.: To make empty; to deprive. [R.]

            Evacuate the Scriptures of their most important
            meaning.                              --Coleridge.

   3. To remove; to eject; to void; to discharge, as the
      contents of a vessel, or of the bowels.

   4. To withdraw from; to quit; to retire from; as, soldiers
      from a country, city, or fortress.

            The Norwegians were forced to evacuate the country.
                                                  --Burke.

   5. To make void; to nullify; to vacate; as, to evacuate a
      contract or marriage. [Obs.] --Bacon.

Source : WordNet®

evacuate
     v 1: move out of an unsafe location into safety; "After the
          earthquake, residents were evacuated"
     2: empty completely; "evacuate the bottle"
     3: move people from their homes or country
     4: create a vacuum in (a bulb, flask, reaction vessel, etc.)
        [syn: {exhaust}]
     5: excrete or discharge from the body [syn: {void}, {empty}]