reward (n.) Look up reward at Dictionary.com
c.1300, "a regarding, heeding, observation," from Old North French reward, variant of Old French reguard (see regard). Meaning "repayment for some service" is from mid-14c.
reward (v.) Look up reward at Dictionary.com
early 14c., from Old North French rewarder, variant of Old French regarder "take notice of, regard, watch over," from re-, intensive prefix, + garder "look, heed, watch" (see guard). Originally any form of requital. Related: Rewarded; rewarding.