Webster's Dictionary, 1913

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Invalide noun [ French] See Invalid , noun

Invalidism noun The condition of an invalid; sickness; infirmity.

Invalidity noun [ Confer French invalidité , Late Latin invaliditas want of health.]

1. Want of validity or cogency; want of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will.

2. Want of health; infirmity. [ Obsolete] Sir W. Temple.

Invalidness noun Invalidity; as, the invalidness of reasoning.

Invalorous adjective Not valorous; cowardly.

Invaluable adjective Valuable beyond estimation; inestimable; priceless; precious.

Invaluably adverb Inestimably. Bp. Hall.

Invalued adjective Inestimable. [ R.] Drayton.

Invariability noun [ Confer French invariabilité .] The quality of being invariable; invariableness; constancy; uniformity.

Invariable adjective [ Prefix in- not + variable : confer French invariable .] Not given to variation or change; unalterable; unchangeable; always uniform.

Physical laws which are invariable .
I. Taylor.

-- In*va"ri*a*ble*ness , noun -- In*va"ri*a*bly , adverb

Invariable noun (Math.) An invariable quantity; a constant.

Invariance noun (Math.) The property of remaining invariable under prescribed or implied conditions. J. J. Sylvester.

Invariant noun (Math.) An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations. J. J. Sylvester.

Invasion noun [ Latin invasio : confer French invasion . See Invade .]

1. The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

2. A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.

3. The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.

Syn. -- Invasion , Irruption , Inroad . Invasion is the generic term, denoting a forcible entrance into a foreign country. Incursion signifies a hasty and sudden invasion. Irruption denotes particularly violent invasion. Inroad is entry by some unusual way involving trespass and injury.

Invasive adjective [ Late Latin invasivus : confer French invasif . See Invade .] Tending to invade; characterized by invasion; aggressive. " Invasive war." Hoole.

Invect intransitive verb To inveigh. [ Obsolete] Beau. & Fl.

Invected adjective [ Latin invectus carried in. See Inveigh .] (Her.) Having a border or outline composed of semicircles with the convexity outward; -- the opposite of engrailed .

Invection noun [ Latin invectio . See Inveigh .] An inveighing against; invective. [ Obsolete] Fulke.

Invective adjective [ Latin invectivus : confer French invectif . See Inveigh .] Characterized by invection; critical; denunciatory; satirical; abusive; railing.

Invective noun [ French invective .] An expression which inveighs or rails against a person; a severe or violent censure or reproach; something uttered or written, intended to cast opprobrium, censure, or reproach on another; a harsh or reproachful accusation; -- followed by against , having reference to the person or thing affected; as, an invective against tyranny.

The world will be able to judge of his [ Junius'] motives for writing such famous invectives .
Sir W. Draper.

Syn. -- Abuse; censure; reproach; satire; sarcasm; railing; diatribe. See Abuse .

Invectively adverb In an invective manner. Shak.

Inveigh intransitive verb [ imperfect & past participle Inveighed ; present participle & verbal noun Inveighing .] [ Latin invehere , invectum , to carry or bring into or against, to attack with words, to inveigh; prefix in- in + vehere to carry. See Vehicle , and confer Invective .] To declaim or rail (against some person or thing); to utter censorious and bitter language; to attack with harsh criticism or reproach, either spoken or written; to use invectives; - - with against ; as, to inveigh against character, conduct, manners, customs, morals, a law, an abuse.

All men inveighed against him; all men, except court vassals, opposed him.

The artificial life against which we inveighed .

Inveigher noun One who inveighs.

Inveigle transitive verb [ imperfect & past participle Inveigled ; present participle & verbal noun Inveigling .] [ Prob. from French aveugler to blind, to delude, Old French aveugler , avugler , avegler , from French aveugle blind, Old French aveugle , avugle , properly, without eyes, from Latin ab + oculus eye. The prefix in- seems to have been substituted for a- taken as the prefix French à , Latin ad . See Ocular .] To lead astray as if blind; to persuade to something evil by deceptive arts or flattery; to entice; to insnare; to seduce; to wheedle.

Yet have they many baits and guileful spells
To inveigle and invite the unwary sense.

Inveiglement noun The act of inveigling, or the state of being inveigled; that which inveigles; enticement; seduction. South.

Inveigler noun One who inveigles.

Inveil transitive verb To cover, as with a vail. W. Browne.

Invendibility noun The quality of being invendible; invendibleness; unsalableness.

Invendible adjective [ Latin invendibilis . See In- not, and Vendible .] Not vendible or salable. Jefferson. -- In*vend"i*ble*ness , noun

Invenom transitive verb See Envenom .

Invent transitive verb [ imperfect & past participle Invented ; present participle & verbal noun Inventing .] [ Latin inventus , past participle of invenire to come upon, to find, invent; prefix in- in + venire to come, akin to English come : confer French inventer . See Come .]

1. To come or light upon; to meet; to find. [ Obsolete]

And vowed never to return again,
Till him alive or dead she did invent .

2. To discover, as by study or inquiry; to find out; to devise; to contrive or produce for the first time; -- applied commonly to the discovery of some serviceable mode, instrument, or machine.

Thus first Necessity invented stools.

3. To frame by the imagination; to fabricate mentally; to forge; -- in a good or a bad sense; as, to invent the machinery of a poem; to invent a falsehood.

Whate'er his cruel malice could invent .

He had invented some circumstances, and put the worst possible construction on others.
Sir W. Scott.

Syn. -- To discover; contrive; devise; frame; design; fabricate; concoct; elaborate. See Discover .

Inventer noun One who invents.

Inventful adjective Full of invention. J. Gifford.

Inventible adjective Capable of being invented.

Inventibleness noun Quality of being inventible.

Invention noun [ Latin inventio : confer French invention . See Invent .]

1. The act of finding out or inventing; contrivance or construction of that which has not before existed; as, the invention of logarithms; the invention of the art of printing.

As the search of it [ truth] is the duty, so the invention will be the happiness of man.

2. That which is invented; an original contrivance or construction; a device; as, this fable was the invention of Esop; that falsehood was her own invention .

We entered by the drawbridge, which has an invention to let one fall if not premonished.

3. Thought; idea. Shak.

4. A fabrication to deceive; a fiction; a forgery; a falsehood.

Filling their hearers
With strange invention .

5. The faculty of inventing; imaginative faculty; skill or ingenuity in contriving anything new; as, a man of invention .

They lay no less than a want of invention to his charge; a capital crime, . . . for a poet is a maker.

6. (Fine Arts, Rhet., etc.) The exercise of the imagination in selecting and treating a theme, or more commonly in contriving the arrangement of a piece, or the method of presenting its parts.

Invention of the cross (Eccl.) , a festival celebrated May 3d, in honor of the finding of our Savior's cross by St. Helena.

Inventious adjective Inventive. [ Obsolete]

Inventive adjective [ Confer French inventif .] Able and apt to invent; quick at contrivance; ready at expedients; as, an inventive head or genius. Dryden. -- In*vent"ive*ly , adverb -- In*vent"ive*ness , noun

Inventor noun [ Latin : confer French inventeur .] One who invents or finds out something new; a contriver; especially, one who invents mechanical devices.

Inventorial adjective Of or pertaining to an inventory. -- In`ven*to"ri*al*ly , adverb Shak.

Inventory noun ; plural Inventories . [ Latin inventarium : confer Late Latin inventorium , French inventaire , Old French also inventoire . See Invent .] An account, catalogue, or schedule, made by an executor or administrator, of all the goods and chattels, and sometimes of the real estate, of a deceased person; a list of the property of which a person or estate is found to be possessed; hence, an itemized list of goods or valuables, with their estimated worth; specifically, the annual account of stock taken in any business.

There take an inventory of all I have.

Syn. -- List; register; schedule; catalogue. See List .

Inventory transitive verb [ imperfect & past participle Inventoried ; present participle & verbal noun Inventorying .] [ Confer French inventorier .] To make an inventory of; to make a list, catalogue, or schedule of; to insert or register in an account of goods; as, a merchant inventories his stock.

I will give out divers schedules of my beauty; it shall be inventoried , and every particle and utensil labeled.

Inventress noun [ Confer Latin inventrix , French inventrice .] A woman who invents. Dryden.

Inveracity noun Want of veracity.

Inverisimilitude noun Want of verisimilitude or likelihood; improbability.

Inverness noun , or In`ver*ness" cape" A kind of full sleeveless cape, fitting closely about the neck.

Robert's wind-blown head and tall form wrapped in an Inverness cape .
Mrs. Humphry Ward.

Inverse adjective [ Latin inversus , past participle of invertere : confer French inverse . See Invert .]

1. Opposite in order, relation, or effect; reversed; inverted; reciprocal; -- opposed to direct .

2. (Botany) Inverted; having a position or mode of attachment the reverse of that which is usual.

3. (Math.) Opposite in nature and effect; -- said with reference to any two operations, which, when both are performed in succession upon any quantity, reproduce that quantity; as, multiplication is the inverse operation to division. The symbol of an inverse operation is the symbol of the direct operation with -1 as an index. Thus sin -1 x means the arc whose sine is x .

Inverse figures (Geom.) , two figures, such that each point of either figure is inverse to a corresponding point in the order figure. -- Inverse points (Geom.) , two points lying on a line drawn from the center of a fixed circle or sphere, and so related that the product of their distances from the center of the circle or sphere is equal to the square of the radius. -- Inverse , or Reciprocal , ratio (Math.) , the ratio of the reciprocals of two quantities. -- Inverse , or Reciprocal , proportion , an equality between a direct ratio and a reciprocal ratio; thus, 4 : 2 : : ⅓ : 1/6 , or 4 : 2 : : 3 : 6, inversely .

Inverse noun That which is inverse.

Thus the course of human study is the inverse of the course of things in nature.

Inversely adverb In an inverse order or manner; by inversion; -- opposed to directly .

Inversely proportional . See Directly proportional , under Directly , and Inversion , 4.

Inversion noun [ Latin inversio : confer French inversion . See Invert .]

1. The act of inverting, or turning over or backward, or the state of being inverted.

2. A change by inverted order; a reversed position or arrangement of things; transposition.

It is just the inversion of an act of Parliament; your lordship first signed it, and then it was passed among the Lords and Commons.

3. (Mil.) A movement in tactics by which the order of companies in line is inverted, the right being on the left, the left on the right, and so on.

4. (Math.) A change in the order of the terms of a proportion, so that the second takes the place of the first, and the fourth of the third.

5. (Geom.) A peculiar method of transformation, in which a figure is replaced by its inverse figure. Propositions that are true for the original figure thus furnish new propositions that are true in the inverse figure. See Inverse figures , under Inverse .

6. (Gram.) A change of the usual order of words or phrases; as, "of all vices, impurity is one of the most detestable," instead of, "impurity is one of the most detestable of all vices."

7. (Rhet.) A method of reasoning in which the orator shows that arguments advanced by his adversary in opposition to him are really favorable to his cause.

8. (Mus.) (a) Said of intervals , when the lower tone is placed an octave higher, so that fifths become fourths, thirds sixths, etc. (b) Said of a chord , when one of its notes, other than its root, is made the bass. (c) Said of a subject , or phrase, when the intervals of which it consists are repeated in the contrary direction, rising instead of falling, or vice versa. (d) Said of double counterpoint , when an upper and a lower part change places.

9. (Geol.) The folding back of strata upon themselves, as by upheaval, in such a manner that the order of succession appears to be reversed.

10. (Chemistry) The act or process by which cane sugar ( sucrose ), under the action of heat and acids or ferments (as diastase ), is broken or split up into grape sugar ( dextrose ), and fruit sugar ( levulose ); also, less properly, the process by which starch is converted into grape sugar ( dextrose ).

» The terms invert and inversion , in this sense, owe their meaning to the fact that the plane of polarization of light, which is rotated to the right by cane sugar, is turned toward the left by levulose.