The Collaborative International Dictionary of English v.0.48:

Muster \Mus"ter\, n. [OE. moustre, OF. mostre, moustre, F.
   montre, LL. monstra. See Muster, v. t.]
   1. Something shown for imitation; a pattern. [Obs.]
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   2. A show; a display. [Obs.] --Piers Plowman.
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   3. An assembling or review of troops, as for parade,
      verification of numbers, inspection, exercise, or
      introduction into service.
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            The hurried muster of the soldiers of liberty.
                                                  --Hawthorne.
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            See how in warlike muster they appear,
            In rhombs, and wedges, and half-moons, and wings.
                                                  --Milton.
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   4. The sum total of an army when assembled for review and
      inspection; the whole number of effective men in an army.
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            And the muster was thirty thousands of men.
                                                  --Wyclif.
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            Ye publish the musters of your own bands, and
            proclaim them to amount of thousands. --Hooker.
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   5. Any assemblage or display; a gathering.
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            Of the temporal grandees of the realm, mentof their
            wives and daughters, the muster was great and
            splendid.                             --Macaulay.
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   Muster book, a book in which military forces are
      registered.

   Muster file, a muster roll.

   Muster master (Mil.), one who takes an account of troops,
      and of their equipment; a mustering officer; an inspector.
      [Eng.]

   Muster roll (Mil.), a list or register of all the men in a
      company, troop, or regiment, present or accounted for on
      the day of muster.

   To pass muster, to pass through a muster or inspection
      without censure.
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            Such excuses will not pass muster with God. --South.
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The Collaborative International Dictionary of English v.0.48:

Muster \Mus"ter\, v. i.
   To be gathered together for parade, inspection, exercise, or
   the like; to come together as parts of a force or body; as,
   his supporters mustered in force. "The mustering squadron."
   --Byron.
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The Collaborative International Dictionary of English v.0.48:

Muster \Mus"ter\, v. t. [imp. & p. p. Mustered; p. pr. & vb.
   n. Mustering.] [OE. mustren, prop., to show, OF. mostrer,
   mustrer, moustrer, monstrer, F. montrer, fr. L. monstrare to
   show. See Monster.]
   1. To collect and display; to assemble, as troops for parade,
      inspection, exercise, or the like. --Spenser.
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   2. Hence: To summon together; to enroll in service; to get
      together. "Mustering all its force." --Cowper.
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            All the gay feathers he could muster. --L'Estrange.
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   To muster troops into service (Mil.), to inspect and enter
      troops on the muster roll of the army.

   To muster troops out of service (Mil.), to register them
      for final payment and discharge.

   To muster up, to gather up; to succeed in obtaining; to
      obtain with some effort or difficulty.
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            One of those who can muster up sufficient
            sprightliness to engage in a game of forfeits.
                                                  --Hazlitt.
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WordNet (r) 3.0 (2006):

muster
    n 1: a gathering of military personnel for duty; "he was thrown
         in the brig for missing muster"
    2: compulsory military service [syn: conscription, muster,
       draft, selective service]
    v 1: gather or bring together; "muster the courage to do
         something"; "she rallied her intellect"; "Summon all your
         courage" [syn: muster, rally, summon, come up,
         muster up]
    2: call to duty, military service, jury duty, etc.

Moby Thesaurus II by Grady Ward, 1.0:

227 Moby Thesaurus words for "muster":
   accumulate, agenda, agglomerate, aggregate, aggregation, aggroup,
   amass, assemblage, assemble, assembly, batch, beadroll,
   beat the drums, bid come, bring together, bugle call, bulk, bunch,
   bunch together, bunch up, cadastre, calendar, call, call away,
   call back, call for, call forth, call in, call out, call to arms,
   call together, call up, call-up, canvass, catchword, census,
   census report, checklist, checkroll, cite, clarion, clarion call,
   clot, clump, cluster, collect, collection, colligate, colligation,
   collocate, collocation, combination, combine, come together,
   commandeer, company, compare, comparison, compile,
   compulsory military service, concourse, concurrence, confluence,
   conflux, congeries, conglomerate, congregate, congregation,
   congress, conjure, conjure up, conscript, conscription, convene,
   convention, converge, convergence, convocation, convoke, copulate,
   corral, corralling, couple, crowd, cumulate, data-gathering, date,
   demand, detach, detach for service, dig up, docket, draft,
   draft call, drafting, dramatis personae, draw together, dredge up,
   drive together, enlist, enlistment, enroll, enrollment, evoke,
   exhortation, flock together, flow together, forgather, fuse,
   gang around, gang up, gather, gather around, gather in,
   gather together, gathering, get in, get together, go for broke,
   group, gung ho, head count, herd together, hive, honor roll, horde,
   huddle, impress, impressment, indent, induct, induction,
   ingathering, inventory, invoke, join, join up, junction, jury list,
   jury panel, juxtapose, juxtaposition, league, levy, lineup, link,
   list, lump together, make the grade, make up, marshal, mass, match,
   measure up, meet, meeting, merge, mill, mobilization, mobilize,
   muster in, muster roll, muster up, nose count, order of business,
   order up, page, pair, partner, pass muster, poll, preconize, press,
   program, property roll, put together, questionnaire, raise,
   rake up, rally, rally around, rallying cry, rebel yell, recall,
   recruit, recruiting, recruitment, rendezvous, requisition, returns,
   rodeo, roll, roll call, roster, rota, round up, roundup,
   scrape together, scroll, seethe, selective service, send after,
   send for, serve, sign, sign on, sign up, slogan, stream, subpoena,
   summon, summon forth, summon up, summons, surge, survey, swarm,
   take up, tax roll, throng, trumpet call, turnout, unite, war cry,
   war whoop, watchword, whip in