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invasion

 - 5 dictionary results

in⋅va⋅sion

  [in-vey-zhuhn]
–noun
1. an act or instance of invading or entering as an enemy, esp. by an army.
2. the entrance or advent of anything troublesome or harmful, as disease.
3. entrance as if to take possession or overrun: the annual invasion of the resort by tourists.
4. infringement by intrusion.
Use invasion in a Sentence
Origin:
1400–50; late ME < LL invāsīon- (s. of invāsiō), equiv. to invās(us), ptp. of invādere + -iōn- -ion; see invade
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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in·va·sion   (ĭn-vā'zhən)   
n.  

  1. The act of invading, especially the entrance of an armed force into a territory to conquer.

  2. A large-scale onset of something injurious or harmful, such as a disease.

  3. An intrusion or encroachment.


[Middle English invasioun, from Old French invasion, from Late Latin invāsiō, invāsiōn-, from invāsus, past participle of invādere, to invade; see invade.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

invasion 
1439, from M.Fr. invasion (12c.), from L.L. invasionem (nom. invasio) "an attack, invasion," from L. invasus, pp. of invadere "go into, fall upon, attack, invade," from in- "in" + vadere "go, walk" (see vamoose). Invade is 1491, from invadere.
Online Etymology Dictionary, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: in·va·sion
Pronunciation: in-'vA-zh&n
Function: noun
: the act of or an instance of invading
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Medical Dictionary

Main Entry: in·va·sion
Pronunciation: in-'vA-zh&n
Function: noun
: the act of invading: as a : the penetration of the bodyof a host by a microorganism b : the spread and multiplication of a pathogenic microorganism or of malignant cells in the body of a host
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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