The Collaborative International Dictionary of English v.0.48:

Conclude \Con*clude"\, v. i.
   1. To come to a termination; to make an end; to close; to
      end; to terminate.
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            A train of lies,
            That, made in lust, conclude in perjuries. --Dryden.
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            And, to conclude,
            The victory fell on us.               --Shak.
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   2. To form a final judgment; to reach a decision.
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            Can we conclude upon Luther's instability? --Bp.
                                                  Atterbury.
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            Conclude and be agreed.               --Shak.
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The Collaborative International Dictionary of English v.0.48:

Conclude \Con*clude"\, v. t. [imp. & p. p. Concluded; p. pr. &
   vb. n. Concluding.] [L. concludere, conclusum; con- +
   claudere to shut. See Close, v. t.]
   1. To shut up; to inclose. [Obs.]
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            The very person of Christ [was] concluded within the
            grave.                                --Hooker.
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   2. To include; to comprehend; to shut up together; to
      embrace. [Obs.]
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            For God hath concluded all in unbelief. --Rom. xi.
                                                  32.
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            The Scripture hath concluded all under sin. --Gal.
                                                  iii. 22.
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   3. To reach as an end of reasoning; to infer, as from
      premises; to close, as an argument, by inferring; --
      sometimes followed by a dependent clause.
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            No man can conclude God's love or hatred to any
            person by anything that befalls him.  --Tillotson.
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            Therefore we conclude that a man is justified by
            faith.                                --Rom. iii.
                                                  28.
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   4. To make a final determination or judgment concerning; to
      judge; to decide.
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            But no frail man, however great or high,
            Can be concluded blest before he die. --Addison.
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            Is it concluded he shall be protector? --Shak.
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   5. To bring to an end; to close; to finish.
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            I will conclude this part with the speech of a
            counselor of state.                   --Bacon.
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   6. To bring about as a result; to effect; to make; as, to
      conclude a bargain. "If we conclude a peace." --Shak.
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   7. To shut off; to restrain; to limit; to estop; to bar; --
      generally in the passive; as, the defendant is concluded
      by his own plea; a judgment concludes the introduction of
      further evidence argument.
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            If therefore they will appeal to revelation for
            their creation they must be concluded by it. --Sir
                                                  M. Hale.

   Syn: To infer; decide; determine; settle; close; finish;
        terminate; end.
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WordNet (r) 3.0 (2006):

conclude
    v 1: decide by reasoning; draw or come to a conclusion; "We
         reasoned that it was cheaper to rent than to buy a house"
         [syn: reason, reason out, conclude]
    2: bring to a close; "The committee concluded the meeting"
    3: reach a conclusion after a discussion or deliberation [syn:
       conclude, resolve]
    4: come to a close; "The concert closed with a nocturne by
       Chopin" [syn: conclude, close]
    5: reach agreement on; "They concluded an economic agreement";
       "We concluded a cease-fire"

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "conclude":
   abort, accommodate, adjust, arrange, assume, be afraid, believe,
   button up, cap, carry to completion, cease, clean up, climax,
   close, close out, close up, close with, collect, complete,
   completed, compose, conceive, concluded, consider, crown,
   culminate, daresay, decide, deduce, deduct, deem, derive,
   determine, divine, done, down, draw, draw a conclusion,
   draw an inference, dream, end, ended, expect, extract, fancy, feel,
   fetch, figure, finalize, find, finish, finish off, finish up,
   finished, fix, gather, get done, get it over, get through,
   get through with, glean, grant, halt, imagine, induce, infer,
   judge, let, let be, make, make out, make up, mop up, opine,
   perfect, perorate, prefigure, presume, presuppose, presurmise,
   provisionally accept, purpose, reason, reason that, reckon, repute,
   resolve, round out, rule, say, scrap, scratch, seal, settle,
   settle with, stop, straighten out, suppose, surmise, suspect, take,
   take a resolution, take as proved, take for, take for granted,
   take it, take to be, terminate, terminated, think, through,
   top off, top out, ultimate, understand, will, wind up, work out,
   wrap up