violent in action or spirit; raging; furious: a rampant leopard.
growing luxuriantly, as weeds.
in full sway; prevailing or unchecked: a rampant rumor.
(of an animal) standing on the hind legs; ramping.
Heraldry. (of a beast used as a charge) represented in profile facing the dexter side, with the body upraised and resting on the left hind leg, the tail and other legs elevated, the right foreleg highest, and the head in profile unless otherwise specified: a lion rampant.
Architecture. (of an arch or vault) springing at one side from one level of support and resting at the other on a higher level.

1350–1400; Middle English < Old French, present participle of ramper to ramp1

rampantly, adverb

3. rife, widespread, unrestrained.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rampant (ˈræmpənt)
1.  unrestrained or violent in behaviour, desire, opinions, etc
2.  growing or developing unchecked
3.  (postpositive) heraldry (of a beast) standing on the hind legs, the right foreleg raised above the left
4.  (of an arch) having one abutment higher than the other
[C14: from Old French ramper to crawl, rear; see ramp]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., "standing on the hind legs" (as a heraldic lion often does), thus, also, "fierce, ravenous" (late 14c.), from O.Fr. rampant, prp. of ramper "to creep, climb" (see rampage). Sense of "growing without check" (in running rampant), first recorded 1610s, preserves the O.Fr. sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the high-impact sport, concussions are rampant, with long-term detrimental
  effects to its players.
Many urban teens don't remember a time without rampant consumerism.
Corruption is rampant and the central government is only keeping things moving
  by threat of prison and firing squad.
The mob is running rampant, and they've infiltrated the police department.
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