noun

1. a messenger sent in haste or on a regular schedule with important or urgent messages; specif.,
   1. a member of the diplomatic corps charged with carrying messages
   2. a spy carrying secret information
2. a person hired to take care of hotel accommodations and luggage and to act as guide for a traveler

Etymology: ME corour (< OFr coreor < LL curritor) & courier (< OFr courrier < It corriere), both ult. < L currere, to run: see current