The Collaborative International Dictionary of English v.0.48:

Dismiss \Dis*miss"\, v. t. [imp. & p. p. Dismissed; p. pr. &
   vb. n. Dismissing.] [L. dis- + missus, p. p. of mittere to
   send: cf. dimittere, OF. desmetre, F. d['e]mettre. See
   Demise, and cf. Dimit.]
   1. To send away; to give leave of departure; to cause or
      permit to go; to put away.
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            He dismissed the assembly.            --Acts xix.
                                                  41.
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            Dismiss their cares when they dismiss their flock.
                                                  --Cowper.
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            Though he soon dismissed himself from state affairs.
                                                  --Dryden.
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   2. To discard; to remove or discharge from office, service,
      or employment; as, the king dismisses his ministers; the
      matter dismisses his servant.
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   3. To lay aside or reject as unworthy of attentions or
      regard, as a petition or motion in court.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dismissed
    adj 1: having lost your job [syn: discharged, dismissed,
           fired, laid-off, pink-slipped]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "dismissed":
   belied, confounded, confuted, contemned, declined,
   declined with thanks, deflated, denied, despised, disapproved,
   discarded, discounted, discredited, disdained, disowned, disproved,
   disputed, excepted, excluded, exploded, exposed, forsworn, ignored,
   impugned, invalidated, negated, negatived, not considered,
   overthrown, overturned, punctured, rebuffed, refused, refuted,
   rejected, renounced, repudiated, repulsed, scouted, shown up,
   spurned, upset