The Collaborative International Dictionary of English v.0.48:

Purpose \Pur"pose\, v. t. [imp. & p. p. Purposed; p. pr. & vb.
   n. Purposing.] [OF. purposer, proposer. See Propose.]
   1. To set forth; to bring forward. [Obs.]
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   2. To propose, as an aim, to one's self; to determine upon,
      as some end or object to be accomplished; to intend; to
      design; to resolve; -- often followed by an infinitive or
      dependent clause. --Chaucer.
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            Did nothing purpose against the state. -- Shak.
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            I purpose to write the history of England from the
            accession of King James the Second down to a time
            which is within the memory of men still living.
                                                  --Macaulay.
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The Collaborative International Dictionary of English v.0.48:

Purpose \Pur"pose\, n. [OF. purpos, pourpos, propos, L.
   propositum. See Propound.]
   1. That which a person sets before himself as an object to be
      reached or accomplished; the end or aim to which the view
      is directed in any plan, measure, or exertion; view; aim;
      design; intention; plan.
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            He will his firste purpos modify.     --Chaucer.
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            As my eternal purpose hath decreed.   -- Milton.
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            The flighty purpose never is o'ertook
            Unless the deed go with it.           --Shak.
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   2. Proposal to another; discourse. [Obs.] --Spenser.
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   3. Instance; example. [Obs.] --L'Estrange.
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   In purpose, Of purpose, On purpose, with previous
      design; with the mind directed to that object;
      intentionally. On purpose is the form now generally used.
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   Syn: design; end; intention; aim. See Design.
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The Collaborative International Dictionary of English v.0.48:

Purpose \Pur"pose\, v. i.
   To have a purpose or intention; to discourse. [Obs.]
   --Spenser.
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WordNet (r) 3.0 (2006):

purpose
    n 1: an anticipated outcome that is intended or that guides your
         planned actions; "his intent was to provide a new
         translation"; "good intentions are not enough"; "it was
         created with the conscious aim of answering immediate
         needs"; "he made no secret of his designs" [syn: purpose,
         intent, intention, aim, design]
    2: what something is used for; "the function of an auger is to
       bore holes"; "ballet is beautiful but what use is it?" [syn:
       function, purpose, role, use]
    3: the quality of being determined to do or achieve something;
       firmness of purpose; "his determination showed in his every
       movement"; "he is a man of purpose" [syn: determination,
       purpose]
    v 1: propose or intend; "I aim to arrive at noon" [syn: aim,
         purpose, purport, propose]
    2: reach a decision; "he resolved never to drink again" [syn:
       purpose, resolve]