The Collaborative International Dictionary of English v.0.48:

Consul \Con"sul\ (k[o^]n"s[u^]l), n. [L., prob. fr. consulere to
   deliberate. See Consult.]
   1. (Rom. Antiq.) One of the two chief magistrates of the
      republic.
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   Note: They were chosen annually, originally from the
         patricians only, but later from the plebeians also.
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   2. A senator; a counselor. [Obs.]
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            Many of the consuls, raised and met,
            Are at the duke's already.            --Shak.
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            With kings and consuls of the earth.  --Job. iii. 14
                                                  (Douay Ver. )
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   3. (Fr. Hist.) One of the three chief magistrates of France
      from 1799 to 1804, who were called, respectively, first,
      second, and third consul.
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   4. An official commissioned to reside in some foreign
      country, to care for the commercial interests of the
      citizens of the appointing government, and to protect its
      seamen.
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   Consul general, a consul of the first rank, stationed in an
      important place, or having jurisdiction in several places
      or over several consuls.

   Vice consul, a consular officer holding the place of a
      consul during the consul's absence or after he has been
      relieved.
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The Devil's Dictionary (1881-1906):

CONSUL, n.  In American politics, a person who having failed to secure
and office from the people is given one by the Administration on
condition that he leave the country.


Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "consul":
   ambassador, ambassadress, apostolic delegate, attache,
   career diplomat, chancellor, charge, commercial attache,
   consul general, consular agent, diplomat, diplomatic,
   diplomatic agent, diplomatist, emissary, envoy,
   envoy extraordinary, foreign service officer, internuncio, legate,
   military attache, minister, minister plenipotentiary,
   minister resident, nuncio, plenipotentiary, resident,
   secretary of legation, vice-consul, vice-legate