Webster's Dictionary, 1913

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Compulsorily adverb In a compulsory manner; by force or constraint.

Compulsory adjective [ Late Latin compulsorius .]
1. Having the power of compulsion; constraining.

2. Obligatory; enjoined by authority; necessary; due to compulsion.

This contribution threatening to fall infinitely short of their hopes, they soon made it compulsory .
Burke.

Compunct adjective [ Late Latin compunctus , past participle ] Affected with compunction; conscience-stricken. [ Obsolete]

Compunction noun [ Old French compunction , French componction , Latin compunctio , from compungere , compunctum , to prick; com- + pungere to prick, sting. See Pungent .]
1. A pricking; stimulation. [ Obsolete]

That acid and piercing spirit which, with such activity and compunction , invadeth the brains and nostrils.
Sir T. Browne.

2. A picking of heart; poignant grief proceeding from a sense of guilt or consciousness of causing pain; the sting of conscience.

He acknowledged his disloyalty to the king, with expressions of great compunction .
Clarendon.

Syn. -- Compunction , Remorse , Contrition . Remorse is anguish of soul under a sense of guilt or consciousness of having offended God or brought evil upon one's self or others. Compunction is the pain occasioned by a wounded and awakened conscience. Neither of them implies true contrition , which denotes self-condemnation, humiliation, and repentance. We speak of the gnawings of remorse ; of compunction for a specific act of transgression; of deep contrition in view of our past lives. See Regret .

Compunctionless adjective Without compunction.

Compunctious adjective Of the nature of compunction; caused by conscience; attended with, or causing, compunction.

That no compunctious visitings of nature
Shake my fell purpose.
Shak.

Compunctiously adverb With compunction.

Compunctive adjective Sensitive in respect of wrongdoing; conscientious. [ Obsolete] Jer. Taylor.

Compurgation noun [ Latin compurgatio , from compurgare to purify wholly; com- + purgare to make pure. See Purge, transitive verb ]
1. (Law) The act or practice of justifying or confirming a man's veracity by the oath of others; -- called also wager of law . See Purgation ; also Wager of law , under Wager .

2. Exculpation by testimony to one's veracity or innocence.

He was privileged from his childhood from suspicion of incontinency and needed no compurgation .
Bp. Hacket.

Compurgator noun [ Late Latin ] One who bears testimony or swears to the veracity or innocence of another. See Purgation ; also Wager of law , under Wager .

All they who know me . . . will say they have reason in this matter to be my compurgators .
Chillingworth.

Compurgatorial adjective Relating to a compurgator or to compurgation. "Their compurgatorial oath." Milman.

Computable adjective [ Latin computabilis .] Capable of being computed, numbered, or reckoned.

Not easily computable by arithmetic.
Sir M. Hale.

Computation noun [ Latin computatio : confer French computation .]
1. The act or process of computing; calculation; reckoning.

By just computation of the time.
Shak.

By a computation backward from ourselves.
Bacon.

2. The result of computation; the amount computed.

Syn. -- Reckoning; calculation; estimate; account.

Compute (kŏm*pūt") transitive verb [ imperfect & past participle Computed ; present participle & verbal noun Computing .] [ Latin computare . See Count , transitive verb ] To determine by calculation; to reckon; to count.

Two days, as we compute the days of heaven.
Milton.

What's done we partly may compute ,
But know not what's resisted.
Burns.

Syn. -- To calculate; number; count; reckon; estimate; enumerate; rate. See Calculate .

Compute noun [ Latin computus : confer French comput .] Computation. [ R.] Sir T. Browne.

Computer (-pūt"ẽr) noun One who computes.

Computist noun A computer.

Comrade noun [ Spanish camarada , from Latin camara , a chamber; hence, a chamber-fellowship, and then a chamber-fellow: confer French camarade . Confer Chamber .] A mate, companion, or associate.

And turned my flying comrades to the charge.
J. Baillie.

I abjure all roofs, and choose . . .
To be a comrade with the wolf and owl.
Shak.

Comradery noun [ Confer French camarederie .] The spirit of comradeship; comradeship. [ R.]

"Certainly", said Dunham, with the comradery of the smoker.
W. D. Howells.

Comradeship noun The state of being a comrade; intimate fellowship.

Comrogue noun A fellow rogue. [ Obsolete]

Comtism noun [ Named after the French philosopher, Auguste Comte .] Positivism; the positive philosophy. See Positivism .

Comtist noun A disciple of Comte; a positivist.

Con adverb [ Abbrev. from Latin contra against.] Against the affirmative side; in opposition; on the negative side; -- The antithesis of pro , and usually in connection with it. See Pro .

Con transitive verb [ imperfect & past participle Conned ; present participle & verbal noun Conning .] [ Anglo-Saxon cunnan to know, be able, and (derived from this) cunnian to try, test. See Can , transitive verb & i. ]
1. To know; to understand; to acknowledge. [ Obsolete]

Of muses, Hobbinol, I con no skill.
Spenser.

They say they con to heaven the highway.
Spenser.

2. To study in order to know; to peruse; to learn; to commit to memory; to regard studiously.

Fixedly did look
Upon the muddy waters which he conned
As if he had been reading in a book.
Wordsworth.

I did not come into Parliament to con my lesson.
Burke.

To con answer , to be able to answer. [ Obsolete] -- To con thanks , to thank; to acknowledge obligation. [ Obsolete] Shak.

Con transitive verb [ See Cond .] (Nautical) To conduct, or superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer.

Con- A prefix, from Latin cum , signifying with , together , etc. See Com- .

Conacre transitive verb To underlet a portion of, for a single crop; -- said of a farm. [ Ireland]

Conacre noun A system of letting a portion of a farm for a single crop. [ Ireland] Also used adjectively; as, the conacre system or principle. Mozley & W.

Conarium noun [ New Latin , from Greek kwna`rion .] (Anat.) The pineal gland.

Conation noun [ Latin conatio .] (Philos.) The power or act which directs or impels to effort of any kind, whether muscular or psychical.

Of conation , in other words, of desire and will.
J. S. Mill.

Conative adjective [ See Conatus .] Of or pertaining to conation.

This division of mind into the three great classes of the cognitive faculties, the feelings, . . . and the exertive or conative powers, . . . was first promulgated by Kant.
Sir W. Hamilton.

Conatus noun [ Latin , from conatus , past participle of conari to attempt.] A natural tendency inherent in a body to develop itself; an attempt; an effort.

What conatus could give prickles to the porcupine or hedgehog, or to the sheep its fleece?
Paley.

Concamerate (kŏn*kăm"ẽr*āt) transitive verb [ Latin concameratus , past participle of concamerare to arch over. See Camber .]
1. To arch over; to vault.

Of the upper beak an inch and a half consisteth of one concamerated bone.
Grew.

2. To divide into chambers or cells. Woodward.

Concameration (-ā"shŭn) noun [ Latin concameratio .]
1. An arch or vault.

2. A chamber of a multilocular shell. Glanvill.

Concatenate (kŏn*kăt"e*nāt) transitive verb [ imperfect & past participle Concatenated ; present participle & verbal noun Concatenating .] [ Latin concatenatus , past participle of concatenare to concatenate. See Catenate .] To link together; to unite in a series or chain, as things depending on one another.

This all things friendly will concatenate .
Dr. H. More

Concatenation (-nā"shŭn) noun [ Latin concatenatio .] A series of links united; a series or order of things depending on each other, as if linked together; a chain, a succession.

The stoics affirmed a fatal, unchangeable concatenation of causes, reaching even to the illicit acts of man's will.
South.

A concatenation of explosions.
W. Irving.

Concause (-kaz") noun A joint cause. Fotherby.

Concavation (kŏn`kȧ*vā"shŭn) noun The act of making concave.

Concave (kŏn*kā*v" or kŏn"-; 277) adjective [ Latin concavus ; con- + cavus hollow: confer French concave . See Cave a hollow.]
1. Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex ; as, a concave mirror; the concave arch of the sky.

2. Hollow; void of contents. [ R.]

As concave . . . as a worm-eaten nut.
Shak.

Concave noun [ Latin concavum .]
1. A hollow; an arched vault; a cavity; a recess.

Up to the fiery concave towering hight.
Milton.

2. (Mech.) A curved sheath or breasting for a revolving cylinder or roll.

Concave transitive verb [ imperfect & past participle concaved ; present participle & verbal noun Concaving .] To make hollow or concave.

Concaved adjective (Her.) Bowed in the form of an arch; -- called also arched .

Concaveness noun Hollowness; concavity.

Concavity noun ; plural Concavities . [ Latin concavitas : confer French concavité . See Concave .] A concave surface, or the space bounded by it; the state of being concave.

Concavo-concave adjective Concave or hollow on both sides; double concave.

Concavo-convex adjective
1. Concave on one side and convex on the other, as an eggshell or a crescent.

2. (Optics) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens .

Concavous adjective [ Latin concavus .] Concave. Abp. potter.

-- Con*ca"vous*ly , adverb

Conceal transitive verb [ imperfect & past participle Concealed ; present participle & verbal noun Concealing .] [ Old French conceler , Latin concelare ; con- + celare to hide; akin to Anglo-Saxon helan , G. hehlen, English hele ( to cover ), helmet . See Hell , Helmet .] To hide or withdraw from observation; to cover; to cover or keep from sight; to prevent the discovery of; to withhold knowledge of.

It is the glory of God to conceal a thing.
Prov. xxv. 2.

Declare ye among the nations, . . . publish and conceal not.
Jer. l. 2.

He which finds him shall deserve our thanks, . . .
He that conceals him, death.
Shak.

Syn. -- To hide; secrete; screen; cover; disguise; dissemble; mask; veil; cloak; screen. -- To Conceal , Hide , Disguise , Dissemble , Secrete . To hide is the generic term, which embraces all the rest. To conceal is simply not make known what we wish to keep secret. In the Bible hide often has the specific meaning of conceal . See 1 Sam. iii. 17, 18. To disguise or dissemble is to conceal by assuming some false appearance. To secrete is to hide in some place of secrecy. A man may conceal facts, disguise his sentiments, dissemble his feelings, secrete stolen goods.

Bur double griefs afflict concealing hearts.
Spenser.

Both dissemble deeply their affections.
Shak.

We have in these words a primary sense, which reveals a future state, and a secondary sense, which hides and secretes it.
Warburton.

Concealable adjective Capable of being concealed.