exclude - v.tr.
1 shut or keep out (a person or thing) from a place, group, privilege, etc.
2 expel and shut out.
3 remove from consideration (no theory can be excluded).
4 prevent the occurrence of; make impossible (excluded all doubt).

excluded middle Logic the principle that of two contradictory propositions one must be true.

excludable adj. excluder n. [ME f. L excludere exclus- (as EX-(1), claudere shut)]