courier-n; 3 Senses

Sense Number 1: a transporter of information (messenger) and/or goods

Commentary: COURIER[+person][+transporter][+information][+messenger][+diplomatic/+espionage] [+goods][+military/+contraband]
NOTE: references a person, not an organization

Examples:
Sally worked as a courier on a bicycle in New York City.
The medication was hand-delivered by courier at 3 AM. (a person dropped it off)
He served as a courier to the American Embassy in Kenya.
The novel is about a double agent during the Cold War who was a courier for the KGB.
The drug cartels have couriers on commercial flights transporting cocaine.
Army couriers risked their lives delivering medicines and other supplies to the front.

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 2: a business that transports small parcels, e.g., documents

Commentary: COURIER[+organization][+business][+transporter][+parcel][+small][+document/+medicine]
NOTE: references a business, not a person

Examples:
That firm is an overnight courier of documents and small packages.
Packages transported by companies that qualify as trusted couriers are not inspected.

Mappings:
WordNet 0.0 Sense Numbers: 1a

Sense Number 3: a paid tour guide

Commentary: COURIER[+person][+guide][+tour]

Examples:
The courier waited by the bus while the tourists explored the shops.
Our Italian courier pointed out interesting architectural details at Pompeii.

Mappings:
WordNet 0.0 Sense Numbers: 2