Source : Webster's Revised Unabridged Dictionary (1913)

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.

            Like fawning courtiers, for success they wait, And
            then come smiling, and declare for fate. --Dryden.

   2. (Law) To state the plaintiff's cause of action at law in a
      legal form; as, the plaintiff declares in trespass.

Declare \De*clare"\, v. t. [imp. & p. p. {Declared}; 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.

   2. To make known by language; to communicate or manifest
      explicitly and plainly in any way; to exhibit; to publish;
      to proclaim; to announce.

            This day I have begot whom I declare My only Son.
                                                  --Milton.

            The heavens declare the glory of God. --Ps. xix. 1.

   3. To make declaration of; to assert; to affirm; to set
      forth; to avow; as, he declares the story to be false.

            I the Lord . . . declare things that are right.
                                                  --Isa. xlv.
                                                  19.

   4. (Com.) To make full statement of, as goods, etc., for the
      purpose of paying taxes, duties, etc.

   {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.

Source : WordNet®

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}]
     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: {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"