reward (v.) Look up reward at Dictionary.com
c. 1300 "to grant, bestow;" early 14c. "to give as compensation," from Old North French rewarder "to regard, reward" (Old French regarder) "take notice of, regard, watch over," from re-, intensive prefix (see re-), + warder "look, heed, watch," from Germanic (see warder). Originally any form of requital. A doublet of regard. Related: Rewarded; rewarding.
reward (n.) Look up reward at Dictionary.com
mid-14c., "a regarding, heeding, observation," from Anglo-French and Old North French reward, back-formation from rewarder (see reward (v.)). Meaning "repayment for some service" is from late 14c. Sense of "sum of money in exchange for capture" is from 1590s.