Source : Webster's Revised Unabridged Dictionary (1913)

Raid \Raid\, n. [Icel. rei[eth] a riding, raid; akin to E. road.
   See {Road} a way.]
   1. A hostile or predatory incursion; an inroad or incursion
      of mounted men; a sudden and rapid invasion by a cavalry
      force; a foray.

            Marauding chief! his sole delight. The moonlight
            raid, the morning fight.              --Sir W.
                                                  Scott.

            There are permanent conquests, temporary occupation,
            and occasional raids.                 --H. Spenser.

   Note: A Scottish word which came into common use in the
         United States during the Civil War, and was soon
         extended in its application.

   2. An attack or invasion for the purpose of making arrests,
      seizing property, or plundering; as, a raid of the police
      upon a gambling house; a raid of contractors on the public
      treasury. [Colloq. U. S.]

Raid \Raid\, v. t. [imp. & p. p. {Raided}; p. pr. & vb. n.
   {Raiding}.]
   To make a raid upon or into; as, two regiments raided the
   border counties.

Source : WordNet®

raid
     n 1: a sudden short attack [syn: {foray}, {maraud}]
     2: an attempt by speculators to defraud investors
     v 1: search without warning, make a sudden surprise attack on;
          "The police raided the crack house" [syn: {bust}]
     2: enter someone else's territory and take spoils; "The pirates
        raided the coastal villages regularly" [syn: {foray into}]
     3: take over (a company) by buying a controlling interest of
        its stock; "T. Boone Pickens raided many large companies"
     4: search for something needed or desired; "Our babysitter
        raided our refrigerator"

Source : Free On-Line Dictionary of Computing

RAID
     
        {Redundant Arrays of Independent Disks}