Smart Definition
Etymology
Pronunciation
exigible
demandable
exigir
to demand
+
-ible
able to be
Exigible means demandable and can be thought of as exigir0 (to demand0) + -ible1 (able to be1), so it's something that is able to be demanded.
adjective
  1. demandable
    That can be demanded or required
    El pago es exigible al final del mes. // The payment is demandable at the end of the month.