The Collaborative International Dictionary of English v.0.48:

Compose \Com*pose"\ (k[o^]m*p[=o]z"), v. t. [imp. & p. p.
   Composed; p. pr. & vb. n. Composing.] [F. composer; com-
   + poser to place. The sense is that of L. componere, but the
   origin is different. See Pose, v. t.]
   1. To form by putting together two or more things or parts;
      to put together; to make up; to fashion.
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            Zeal ought to be composed of the highest degrees of
            all pious affection.                  --Bp. Sprat.
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   2. To form the substance of, or part of the substance of; to
      constitute.
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            Their borrowed gold composed
            The calf in Oreb.                     --Milton.
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            A few useful things . . . compose their intellectual
            possessions.                          --I. Watts.
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   3. To construct by mental labor; to design and execute, or
      put together, in a manner involving the adaptation of
      forms of expression to ideas, or to the laws of harmony or
      proportion; as, to compose a sentence, a sermon, a
      symphony, or a picture.
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            Let me compose
            Something in verse as well as prose.  --Pope.
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            The genius that composed such works as the
            "Standard" and "Last Supper".         --B. R.
                                                  Haydon.
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   4. To dispose in proper form; to reduce to order; to put in
      proper state or condition; to adjust; to regulate.
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            In a peaceful grave my corpse compose. --Dryden.
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            How in safety best we may
            Compose our present evils.            --Milton.
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   5. To free from agitation or disturbance; to tranquilize; to
      soothe; to calm; to quiet.
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            Compose thy mind;
            Nor frauds are here contrived, nor force designed.
                                                  --Dryden.
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   6. (Print.) To arrange (types) in a composing stick in order
      for printing; to set (type).
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The Collaborative International Dictionary of English v.0.48:

Composed \Com*posed"\, a.
   Free from agitation; calm; sedate; quiet; tranquil;
   self-possessed.
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         The Mantuan there in sober triumph sate,
         Composed his posture, and his look sedate. --Pope.
   -- Com*pos"ed*ly, adv. -- Com*pos"ed*ness, n.
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WordNet (r) 3.0 (2006):

composed
    adj 1: serenely self-possessed and free from agitation
           especially in times of stress; "the performer seemed
           completely composed as she stepped onto the stage"; "I
           felt calm and more composed than I had in a long time"
           [ant: discomposed]

Moby Thesaurus II by Grady Ward, 1.0:

127 Moby Thesaurus words for "composed":
   accepting, aligned, amalgam, amalgamation, arranged, arrayed,
   assorted, assured, at ease, aweless, balanced, calm, categorized,
   classified, collected, combination, comfortable, commixture,
   compact of, composed of, composing, composite, compost, compound,
   comprising, confident, consisting of, constituted, constituting,
   contained in, containing, content, contented, cool, disposed, easy,
   easygoing, embodied in, embodying, equanimous, equilibrious,
   eupeptic, euphoric, expected, expecting, fixed, formed of, graded,
   grouped, happy, harmonized, immixture, imperturbable, including,
   inclusive of, inexcitable, intermixture, levelheaded, made of,
   made out of, made up of, marshaled, methodized, mix, mix-up,
   nonchalant, normalized, of good comfort, ordered, orderly,
   organized, placed, placid, pleased, poised, possessed, quiet,
   ranged, ranked, recollected, reconciled, regularized, regulated,
   repressed, resigned, routinized, sans souci, satisfied, sedate,
   self-assured, self-confident, self-controlled, self-possessed,
   self-restrained, serene, serious, sorted, staid, standardized,
   still, subsuming, suppressed, synchronized, systematized, together,
   tranquil, unamazed, unastonished, unastounded, unawed,
   unbewildered, uncomplaining, undazed, undazzled, undumbfounded,
   unflappable, unimpressed, union, unmarveling, unmoved, unrepining,
   unruffled, unsurprised, unwondering, well-balanced, without care,
   wonderless