The Collaborative International Dictionary of English v.0.48:

Declare \De*clare"\, v. i.
   1. To make a declaration, or an open and explicit avowal; to
      proclaim one's self; -- often with for or against; as,
      victory declares against the allies.
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            Like fawning courtiers, for success they wait,
            And then come smiling, and declare for fate.
                                                  --Dryden.
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   2. (Law) To state the plaintiff's cause of action at law in a
      legal form; as, the plaintiff declares in trespass.
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The Collaborative International Dictionary of English v.0.48:

Declare \De*clare"\ (d[-e]*kl[^a]r"), v. t. [imp. & p. p.
   Declared (d[-e]*kl[^a]rd"); p. pr. & vb. n. Declaring.]
   [F. d['e]clarer, from L. declarare; de + clarare to make
   clear, clarus, clear, bright. See Clear.]
   1. To make clear; to free from obscurity. [Obs.] "To declare
      this a little." --Boyle.
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   2. To make known by language; to communicate or manifest
      explicitly and plainly in any way; to exhibit; to publish;
      to proclaim; to announce.
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            This day I have begot whom I declare
            My only Son.                          --Milton.
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            The heavens declare the glory of God. --Ps. xix. 1.
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   3. To make declaration of; to assert; to affirm; to set
      forth; to avow; as, he declares the story to be false.
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            I the Lord . . . declare things that are right.
                                                  --Isa. xlv.
                                                  19.
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   4. (Com.) To make full statement of, as goods, etc., for the
      purpose of paying taxes, duties, etc.
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   To declare off, to recede from an agreement, undertaking,
      contract, etc.; to renounce.

   To declare one's self, to avow one's opinion; to show
      openly what one thinks, or which side he espouses.
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WordNet (r) 3.0 (2006):

declare
    v 1: state emphatically and authoritatively; "He declared that
         he needed more money to carry out the task he was charged
         with"
    2: announce publicly or officially; "The President declared war"
       [syn: announce, declare]
    3: state firmly; "He declared that he was innocent"
    4: declare to be; "She was declared incompetent"; "judge held
       that the defendant was innocent" [syn: declare, adjudge,
       hold]
    5: authorize payments of; "declare dividends"
    6: designate (a trump suit or no-trump) with the final bid of a
       hand
    7: make a declaration (of dutiable goods) to a customs official;
       "Do you have anything to declare?"
    8: proclaim one's support, sympathy, or opinion for or against;
       "His wife declared at once for moving to the West Coast"

Moby Thesaurus II by Grady Ward, 1.0:

121 Moby Thesaurus words for "declare":
   acknowledge, acquaint, admit, advertise, advise, affirm, air,
   allege, announce, annunciate, apprise, argue, assert, assever,
   asseverate, aver, avouch, avow, bid, blazon, bring out, broach,
   broadcast, bruit about, call on, call the signals, call upon,
   certify, charge, chime in, claim, come out with, command,
   commission, communicate, confess, confirm, contend,
   declare roundly, decree, deliver, depose, dictate, direct,
   disclose, discover, disseminate, divulge, enjoin, enunciate,
   express, express the belief, give an order, give notice,
   give the word, have, herald, hold, impart, inform, insist,
   instruct, issue a command, issue a manifesto, issue a statement,
   issue a writ, lay down, maintain, make a statement,
   make an announcement, make known, make public, mandate, manifesto,
   notify, nuncupate, offer, ordain, order, order about, own,
   predicate, proclaim, profess, promulgate, pronounce, protest,
   publish, publish a manifesto, put, put it, quote, ratify, recite,
   relate, report, reveal, rule, say, say the word, set down, sound,
   speak, speak out, speak up, stand for, stand on, state, submit,
   swear, tell, throw out, toot, trumpet forth, utter, vend, vent,
   ventilate, voice, vow, warrant