Definitions:

1. a gathering of persons representative of some larger group noun
   • each nation sent a contingent of athletes to the Olympics
2. a temporary military unit noun
   • the peacekeeping force includes one British contingent
3. determined by conditions or circumstances that follow adjective
   • arms sales contingent on the approval of congress
4. possible but not certain to occur adjective
   • they had to plan for contingent expenses
5. uncertain because of uncontrollable circumstances adjective
   • the results of confession were not contingent, they were certain George Eliot

Synonyms:

• contingent on
• contingent upon
• dependant on
• dependant upon
• dependent on
• dependent upon
• depending on
• detail