n (context|now|_|regional) A bag or wallet. (defdate|from 13th c.)
n A bag containing letters to be delivered by post; the material conveyed by the postal service. (defdate|from 17th c.)
n A person or vehicle that delivers such post; the postal service or system in general. (defdate|from 17th c.)
n (context|chiefly|_|US) The letters, parcels etc delivered to a particular address or person. (defdate|from 19th c.)
n (uncountable)electronic mail, e-mail: a computernetwork–based service for sending, storing, and forwarding electronic messages. (defdate|from 20th c.)