Invasion - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

in·va·sion

Audio Help [in-vey-zhuh

n] Pronunciation Key

–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.

[Origin: 1400–50; late ME < LL invāsīon- (s. of invāsiō), equiv. to invās(us), ptp. of invādere + -iōn- -ion; see invade

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Invasion

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American Heritage Dictionary - Cite This Source - Share This

in·va·sion Audio Help (ĭn-vā'zhən) Pronunciation Key
n.

The act of invading, especially the entrance of an armed force into a territory to conquer.
A large-scale onset of something injurious or harmful, such as a disease.
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.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
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.

WordNet - Cite This Source - Share This

invasion
noun
1.	the act of invading; the act of an army that invades for conquest or plunder
2.	any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts"
3.	(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body; "the tumor's invasion of surrounding structures"

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
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 Dictionary of Law - Cite This Source - Share This
Main Entry: in·va·sion
Pronunciation: in-'vA-zh&n
Function: noun
: the act of or an instance of invading

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Invasion

In*cur"sion\, n. [L. incursio: cf. F. incursion. See Incur.]

1. A running into; hence, an entering into a territory with hostile intention; a temporary invasion; a predatory or harassing inroad; a raid.

The Scythian, whose incursions wild Have wasted Sogdiana. --Milton.

The incursions of the Goths disordered the affairs of the Roman Empire. --Arbuthnot.

2. Attack; occurrence. [Obs.]

Sins of daily incursion. --South.

Syn: Invasion; inroad; raid; foray; sally; attack; onset; irruption. See Invasion.

On-line Medical Dictionary - Cite This Source - Share This

invasion

invasion: in CancerWEB's On-line Medical Dictionary