n. The act of excluding or shutting out; a debarring; non-admission.n. Non-inclusion or non-reception; exception.n. In logic, the relation of two terms each of which is totally denied of the other. Thus, animal and plant stand to each other in a relation of exclusion, provided it is true that no animal is a plant.n. The act of thrusting out or expelling; ejection; extrusion.n. That which is emitted or thrown out; excretion.n. A method in the theory of numbers invented by Frenicle de Bessy, and now forgotten.