Definition of "Contingent" :

noun: a gathering of persons representative of some larger group

"Each nation sent a contingent of athletes to the Olympics."

noun: a temporary military unit

"The peacekeeping force includes one British contingent."

adjective: uncertain because of uncontrollable circumstances

"The results of confession were not contingent, they were certain."

adjective: being determined by conditions or circumstances that follow

"Arms sales contingent on the approval of congress."

adjective: possible but not certain to occur

"They had to plan for contingent expenses."