a sudden assault or attack, as upon something to be seized or suppressed: a police raid on a gambling ring.
Military. a sudden attack on the enemy, as by air or by a small land force.
a vigorous, large-scale effort to lure away a competitor's employees, members, etc.
Finance. a concerted attempt of speculators to force stock prices down.
verb (used with object)
to make a raid on.
to steal from; loot: a worry that the investment fund is being raided.
to entice away from another: Large companies are raiding key personnel from smaller companies.
to indulge oneself by taking from, especially in order to eat: raiding the cookie jar.
verb (used without object)
to engage in a raid.

1375–1425; Middle English (north and Scots) ra(i)de, Old English rād expedition, literally, a riding; doublet of road

counterraid, noun, verb
unraided, adjective

1. seizure. 2. incursion, invasion, inroad. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
raid (reɪd)
1.  a sudden surprise attack: an air raid
2.  a surprise visit by police searching for criminals or illicit goods: a fraud-squad raid
3.  to make a raid against (a person, thing, etc)
4.  to sneak into (a place) in order to take something, steal, etc: raiding the larder
[C15: Scottish dialect, from Old English rād military expedition; see road]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., "military expedition on horseback," Scottish and northern English form of rade "a riding, journey," from O.E. rad "a riding" (see road). The word died out by 17c., but was revived by Scott, 1805 ("The Lay of the Last Minstrel") and 1818 ("Rob Roy"), with extended
sense of "attack, foray." The verb is from 1865.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
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The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The raids occurred before dawn, while students were sleeping.
Barbarian raids began from the north and grew in scope and intensity.
Objects were unearthed from backyards, fished out of a cesspool, recovered in
  pre-dawn raids.
Horses soon dramatically altered the state of war, with warriors adopting the
  animals as a vehicle for sudden attacks and raids.
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