Definition of courier
1 : messenger: such as
a : a member of a diplomatic (see diplomatic sense 2) service entrusted with bearing messages
b(1) : an espionage agent transferring secret information
(2) : a runner of contraband (see contraband sense 2)
drug couriers
c : a member of the armed services whose duties include carrying mail, information, or supplies
2 : a traveler's paid attendant especially : a tourists' guide employed by a travel agency
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Time Traveler for courier
The first known use of courier was in 1579
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