The definition of a courier is a person or company who transmits messages or transports messages and packages.
(noun)See courier in Webster's New World College Dictionary
noun
Origin: ME corour (< OFr coreor < LL curritor) & courier (< OFr courrier < It corriere), both ult. < L currere, to run: see current
See courier in American Heritage Dictionary 4
noun
Origin:
Origin: French courrier
Origin: , from Old French
Origin: , from Old Italian corriere
Origin: , from correre, to run
Origin: , from Latin currere; see kers- in Indo-European roots
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