Dictionary

An event which may or may not happen; that which is unforeseen, undetermined, or dependent on something future.

That which falls to one in a division or apportionment among a number; a suitable share.

A quota of troops.

Possible or liable, but not certain to occur.

(with upon or on) Dependent on something that is undetermined or unknown.

Example: The success of his undertaking is contingent upon events which he cannot control.

Dependent on something that may or may not occur.

Example: a contingent estate

Not logically necessarily true or false.