The Collaborative International Dictionary of English v.0.48:

Consent \Con*sent"\, v. i. [imp. & p. p. Consented; p. pr. &
   vb. n. Consenting.] [F. consentir, fr. L. consentire,
   -sensum, to feel together, agree; con- + sentire to feel. See
   Sense.]
   1. To agree in opinion or sentiment; to be of the same mind;
      to accord; to concur.
      [1913 Webster]

            And Saul was consenting unto his death. --Acts.
                                                  viii. 1.
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            Flourishing many years before Wyclif, and much
            consenting with him in jugdment.      --Fuller.
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   2. To indicate or express a willingness; to yield to
      guidance, persuasion, or necessity; to give assent or
      approval; to comply.
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            My poverty, but not my will, consents. --Shak.
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            And whispering "I will ne'er consent," -- consented.
                                                  --Byron.

   Syn: To accede; yield; assent; comply; agree; allow; concede;
        permit; admit; concur; acquiesce.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Consent \Con*sent"\, v. t.
   To grant; to allow; to assent to; to admit. [Obs.]
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         Interpreters . . . will not consent it to be a true
         story.                                   --Milton.
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The Collaborative International Dictionary of English v.0.48:

Consent \Con*sent"\, n. [Cf. OF. consent.]
   1. Agreement in opinion or sentiment; the being of one mind;
      accord.
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            All with one consent began to make excuse. --Luke
                                                  xiv. 18.
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            They fell together all, as by consent. --Shak.
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   2. Correspondence in parts, qualities, or operations;
      agreement; harmony; coherence.
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            The melodious consent of the birds.   --Holland.
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            Such is the world's great harmony that springs
            From union, order, full consent of things. --Pope.
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   3. Voluntary accordance with, or concurrence in, what is done
      or proposed by another; acquiescence; compliance;
      approval; permission.
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            Thou wert possessed of David's throne
            By free consent of all.               --Milton.
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   4. (Law) Capable, deliberate, and voluntary assent or
      agreement to, or concurrence in, some act or purpose,
      implying physical and mental power and free action.
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   5. (Physiol.) Sympathy. See Sympathy, 4.

   Syn: Assent; acquiescence; concurrence; agreement; approval;
        permission. See Assent.
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   Age of consent (Law), an age, fixed by statute and varying
      in different jurisdictions, at which one is competent to
      give consent. Sexual intercourse with a female child under
      the age of consent is punishable as rape.
      [1913 Webster]

WordNet (r) 3.0 (2006):

consent
    n 1: permission to do something; "he indicated his consent"
    v 1: give an affirmative reply to; respond favorably to; "I
         cannot accept your invitation"; "I go for this resolution"
         [syn: accept, consent, go for] [ant: decline,
         refuse]

Moby Thesaurus II by Grady Ward, 1.0:

221 Moby Thesaurus words for "consent":
   OK, abide by, accede, accede to, accept, acceptance, accession,
   acclaim, acclamation, accord, accord to, accordance, acquiesce,
   acquiesce in, acquiescence, admission, admit, agree, agree to,
   agree with, agreeability, agreeableness, agreement,
   agreement in principle, agreement of all, alacrity, allow,
   allowance, amenability, applaud, approval, approve, approve of,
   ardor, assent, assentation, authorization, authorize, be agreeable,
   be agreeable to, be dying to, be eager, be game, be open to,
   be ready, be spoiling for, be willing, buy, cede, charter, cheer,
   cheerful consent, chorus, collaborate, common assent,
   common consent, complaisance, compliance, comply, concede, concert,
   concord, concordance, concur, concurrence, condescend, conform,
   connive at, consensus, consensus gentium, consensus of opinion,
   consensus omnium, consent to, consent to silently, consentaneity,
   cooperate, cooperativeness, deference, deign, dispensation,
   dispense, docility, eagerness, endorse, enthusiasm, face the music,
   favorable disposition, favorableness, forwardness, gameness,
   general acclamation, general agreement, general consent,
   general voice, give consent, give in, give leave, give permission,
   give the go-ahead, give the nod, give the word, go along with,
   go-ahead, goodwill, grant, hail, harmony, have no objection,
   hearty assent, hold with, homage, imprimatur, in toto, incline,
   kneeling, knock under, knuckle down, knuckle under, lean, leave,
   let, liberty, license, like-mindedness, live with it,
   look kindly upon, make possible, meeting of minds,
   mutual understanding, nod, nod assent, nonopposal, nonopposition,
   nonresistance, not hesitate to, not refuse, not resist, obedience,
   obeisance, obey, okay, one accord, one voice, passiveness,
   passivity, patent, permission, permission to enter, permit,
   pliability, pliancy, plunge into, promptness, ratify, readiness,
   receive, receptive mood, receptiveness, receptivity, release,
   relent, resign, resignation, resignedness, responsiveness,
   right mood, same mind, sanction, say aye, say the word, say yes,
   seal of approval, single voice, special permission, subjection,
   submission, submit, submittal, subscribe, subscribe to, succumb,
   sufferance, supineness, support, swallow it, swallow the pill,
   take, take it, take kindly to, ticket, ticket of admission,
   total agreement, tractability, unanimity, unanimousness,
   understanding, ungrudgingness, unison, universal agreement,
   unloathness, unreluctance, vote affirmatively, vote aye, vote for,
   vouchsafe, vouchsafement, waiver, warm assent, welcome,
   willing ear, willing heart, willingness, wink at, would as leave,
   would as lief, yes, yield, yield assent, yielding, zeal,
   zealousness



Bouvier's Law Dictionary, Revised 6th Ed (1856):

CONSENT. An agreement to something proposed, and differs from assent. (q.v.)
Wolff, Ins. Nat. part 1, SSSS 27-30; Pard. Dr. Com. part 2, tit. 1, n.
1, 38 to 178. Consent supposes, 1. a physical power to act; 2. a moral power
of acting; 3. a serious, determined, and free use of these powers. Fonb. Eq.
B; 1, c. 2, s. 1; Grot. de Jure Belli et Pacis, lib. 2, c. 11, s. 6.
     2. Consent is either express or implied. Express, when it is given viva
voce, or in writing; implied, when it is manifested by signs, actions, or
facts, or by inaction or silence, which raise a presumption that the consent
has been given.
     3. - 1. When a legacy is given with a condition annexed to the bequest,
requiring the consent of executors to the marriage of the legatee, and under
such consent being given, a mutual attachment has been suffered to grow up,
it would be rather late to state terms and conditions on which a marriage
between the parties should take place;. 2 Ves. & Beames, 234; Ambl. 264; 2
Freem. 201; unless such consent was obtained by deceit or fraud. 1 Eden, 6;
1 Phillim. 200; 12 Ves. 19.
     4. - 2. Such a condition does not apply to a second marriage. 3 Bro. C.
C. 145; 3 Ves. 239.
     5. - 3. If the consent has been substantially given, though not modo et
forma, the legatee will be held duly entitled to the legacy. 1 Sim. & Stu.
172; 1 Meriv. 187; 2 Atk. 265.
     6. - 4. When trustees under a marriage settlement are empowered to sell
"with the consent of the husband and, wife," a sale made by the trustees
without the distinct consent of the wife, cannot be a due execution of their
power. 10 Ves. 378.
     7. - 5. Where a power of sale requires that the sale should be with the
consent of certain specified individuals, the fact of such consent having
been given, ought to be evinced in the manner pointed out by the creator of
the power, or such power will not be considered as properly executed. 10
Ves. 308. Vide, generally, 2 Supp. to Ves. jr. 161, 165, 169; Ayliffe's
Pand. 117; 1 Rob. Leg.. 345, 539.
     8. - 6. Courts of equity have established the rule, that when the true
owner of property stands by, and knowingly suffers a stranger to sell the
same as his own, without objection, this will be such implied consent as to
render the sale valid against the true owner. Story on Ag. Sec. 91 Story on
Eq. Jur. Sec. 385 to 390. And courts of law, unless restrained by technical
formalities, act upon the principles of justice; as, for example, when a man
permitted, without objection, the sale of his goods under an execution
against another person. 6 Adolph. & El 11. 469 9 Barn. & Cr. 586; 3 Barn. &
Adolph. 318, note.
     9. The consent which is implied in every agreement is excluded, 1. By
error in the essentials of the contract; ,is, if Paul, in the city of
Philadelphia, buy the horse of Peter, which is in Boston, and promise to pay
one hundred dollars for him, the horse at the time of the sale, unknown to
either party, being dead. This decision is founded on the rule that he who
consents through error does not consent at all; non consentiunt qui errant.
Dig. 2, 1, 15; Dig. lib. 1, tit. ult. 1. 116, Sec. 2. 2. Consent is excluded
by duress of the party making the agreement. 3. Consent is never given so as
to bind the parties, when it is obtained by fraud. 4. It cannot be given by
a person who has no understanding, as an idiot, nor by one who, though
possessed of understanding, is not in law capable of making a contract, as a
feme covert. See Bouv. Inst. Index, h.t.