contingent

noun

1. An event which may or may not happen; that which is unforeseen, undetermined, or dependent on something in the future.
2. That which falls to one in a division or apportionment among a number; a suitable share.
3. A quota of troops.

   “Arrests and prosecutions intensified after Isis captured Mosul in June, but the groundwork had been laid by an earlier amendment to Jordan’s anti-terrorism law. It is estimated that 2,000 Jordanians have fought and 250 of them have died in Syria – making them the third largest Arab contingent in Isis after Saudi Arabians and Tunisians.”

adj

1. Possible or liable, but not certain, to occur.
2. Dependent on something that is undetermined or unknown, that may or may not occur.

   “The success of his undertaking is contingent upon events which he cannot control.”

   “a contingent estate”

   “The imposition of the death penalty should not be contingent on a particular jury's unguided understanding of a legal term of art.”

   “This rather narrow theological dispute eventually helped eradicate from Western philosophy the idea of universals—the notion that concepts in the mind correspond to eternal truths, like the Platonic forms—and succeeded in making the world, as Blumenberg puts it, “radically contingent.””

   “Both Catalan parties have said their support for getting the PSOE back into office will be contingent on an amnesty for the hundreds of people who participated in the failed push to secede from Spain in October 2017.”

3. Not logically necessarily true or false.
4. Temporary.

   “contingent labor”

   “contingent worker”