Source : Webster's Revised Unabridged Dictionary (1913)

Ambuscade \Am`bus*cade"\, n. [F. embuscade, fr. It. imboscata,
   or Sp. emboscada, fr. emboscar to ambush, fr. LL. imboscare.
   See {Ambush}, v. t.]
   1. A lying in a wood, concealed, for the purpose of attacking
      an enemy by surprise. Hence: A lying in wait, and
      concealed in any situation, for a like purpose; a snare
      laid for an enemy; an ambush.

   2. A place in which troops lie hid, to attack an enemy
      unexpectedly. [R.] --Dryden.

   3. (Mil.) The body of troops lying in ambush.

Ambuscade \Am`bus*cade"\, v. t. [imp. & p. p. {Ambuscaded}; p.
   pr. & vb. n. {Ambuscading}.]
   1. To post or conceal in ambush; to ambush.

   2. To lie in wait for, or to attack from a covert or lurking
      place; to waylay.

Ambuscade \Am`bus*cade"\, v. i.
   To lie in ambush.

Source : WordNet®

ambuscade
     n : the act of concealing yourself and lying in wait to attack
         by surprise [syn: {ambush}, {lying in wait}, {trap}]
     v : wait in hiding to attack [syn: {ambush}, {scupper}, {bushwhack},
          {waylay}, {lurk}, {lie in wait}]