/ ˈkʊriə(r); NAmE / noun
1.
a person or company whose job is to take packages or important papers somewhere :
We sent the documents by courier.
2.
( BrE ) a person who is employed by a travel company to give advice and help to a group of tourists on holiday
► cour·ier verb :
[ vn ]
Courier that letter—it needs to get there today (= send it by courier ) .
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WORD ORIGIN
late Middle English (denoting a person sent to run with a message): originally from Old French coreor ; later from French courier (now courrier ), from Italian corriere ; based on Latin currere to run.