A proposition is a sentence expressing something true or false.
Proposition may also refer to:
In logic, mathematics, and philosophy
Propositional calculus (also propositional logic or sentential calculus) - a formal system in which formulae representing propositional formulas can be formed
Propositional formula - a type of syntactic formula which is well formed and has a truth value; i.e., an assertion formulated in such a way that it may be proven true or false