<hw>In*va"ri*a*ble</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Pref. <ets>in-</ets> not + <ets>variable</ets>: cf. F. <ets>invariable</ets>.]</ety> <def>Not given to variation or change; unalterable; unchangeable; always uniform.</def>
<blockquote>Physical laws which are <b>invariable</b>. <i>I. Taylor.</i></blockquote>
-- <wordforms><wf>In*va"ri*a*ble*ness</wf>, <tt>n.</tt> -- <wf>In*va"ri*a*bly</wf>, <tt>adv.</tt></wordforms>
<h1>Invariable</h1> <Xpage=784>
<hw>In*va"ri*a*ble</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Math.)</fld> <def>An invariable quantity; a constant.</def>
<h1>Invariance</h1> <Xpage=784>
<hw>In*va"ri*ance</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Math.)</fld> <def>The property of remaining invariable under prescribed or implied conditions.</def>
<i>J. J. Sylvester.</i>
<h1>Invariant</h1> <Xpage=784>
<hw>In*va"ri*ant</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Math.)</fld> <def>An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations.</def>
<i>J. J. Sylvester.</i>
<h1>Invasion</h1> <Xpage=784>
<hw>In*va"sion</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L. <ets>invasio</ets>: cf. F. <ets>invasion</ets>. See <er>Invade</er>.]</ety>
<p><b>1.</b> <def>The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.</def>
<p><b>2.</b> <def>A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.</def>
<p><b>3.</b> <def>The incoming or first attack of anything hurtful or pernicious; <as>as, the <ex>invasion</ex> of a disease</as>.</def>
<syn>Syn. -- <er>Invasion</er>, <er>Irruption</er>, <er>Inroad</er>.</syn> <usage> <i>Invasion</i> is the generic term, denoting a forcible entrance into a foreign country. <i>Incursion</i> signifies a hasty and sudden invasion. <i>Irruption</i> denotes particularly violent invasion. <i>Inroad</i> is entry by some unusual way involving trespass and injury.</usage>
<h1>Invasive</h1> <Xpage=784>
<hw>In*va"sive</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[LL. <ets>invasivus</ets>: cf. F. <ets>invasif</ets>. See <er>Invade</er>.]</ety> <def>Tending to invade; characterized by invasion; aggressive.</def> "<i>Invasive</i> war."
<i>Hoole.</i>
<h1>Invect</h1> <Xpage=784>
<hw>In*vect"</hw> <tt>(?)</tt>, <tt>v. i.</tt> <def>To inveigh.</def> <mark>[Obs.]</mark>
<i>Beau. & Fl.</i>
<h1>Invected</h1> <Xpage=784>
<hw>In*vec"ted</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[L. <ets>invectus</ets> carried in. See <er>Inveigh</er>.]</ety> <fld>(Her.)</fld> <def>Having a border or outline composed of semicircles with the convexity outward; -- the opposite of <i>engrailed</i>.</def>
<h1>Invection</h1> <Xpage=784>
<hw>In*vec"tion</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L. <ets>invectio</ets>. See <er>Inveigh</er>.]</ety> <def>An inveighing against; invective.</def> <mark>[Obs.]</mark>
<i>Fulke.</i>
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