Real Dictionary

reward
countable noun: A reward is something that you are given, for example because you have behaved well, worked hard, or provided a service to the community.

reward in American English
something given in return for good or, sometimes, evil, or for service or merit
to give a reward to
noun: a sum of money offered for the detection or capture of a criminal, the recovery of lost or stolen property, etc.
transitive verb: to recompense or requite (a person or animal) for service, merit, achievement, etc.

reward in British English
noun: something given or received in return for a deed or service rendered
verb: to give (something) to (someone), esp in gratitude for a service rendered; recompense