What is the difference between Proposition and Proposal?

Question

How to use these words?

Answer 1

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In common philosophical language, a proposition is the content of an assertion, that is, it is true-or-false and defined by the meaning of a particular piece of language. The proposition is independent of the medium of communication. Since the definition of "proposition" is such a crucial matter to various topics in philosophy, the nature of propositions is highly controversial. Even the existence of propositions is sometimes called into question and, as a result, the term is widely used, even when the term is not itself explicitly defined and therefore confusion, in regard to "meaning", may arise.

A proposal can refer to a business proposition, sometimes prompted by a Request for Proposal or an offer of marriage.

Source(s):

http://en.wikipedia.org/wiki/Proposition