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"