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.
He will his firste purpos modify. --Chaucer.
As my eternal purpose hath decreed. -- Milton.
The flighty purpose never is o'ertook
Unless the deed go with it. --Shak.
2. Proposal to another; discourse. [Obs.] --Spenser.
3. Instance; example. [Obs.] --L'Estrange.
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.
Syn: design; end; intention; aim. See Design.