- (uncountable) Electronic mail, e-mail: a computer network–based service for sending, storing, and forwarding electronic messages. [from 20thc.]
- (nautical) A contrivance of interlinked rings, for rubbing off the loose hemp on lines and white cordage.
- (chiefly Scotland) Rent.
- The material conveyed by the postal service. [from 17thc.]
"Don't forget to pick up the mail on your way."
- (chiefly US, uncountable) The letters, parcels etc delivered to a particular address or person. [from 19thc.]
- (uncountable) Armour consisting of metal rings or plates linked together.
- (obsolete, rare) A spot on a bird's feather; by extension, a spotted feather.
- (chiefly Scotland) A monetary payment or tribute.
- A bag containing letters to be delivered by post.
- The postal service or system in general. [from 17thc.]
"He decided to send his declaration by mail."
- A trunk, box, or bag, in which clothing, etc., may be carried.
- Any hard protective covering of an animal, as the scales and plates of reptiles, shell of a lobster, etc.
- (now regional) A bag or wallet. [from 13thc.]
- (chiefly Scotland) Tax.
- (dated) A stagecoach, train or ship that delivers such post.
- (transitive) To send by electronic mail.
"Please mail me the spreadsheet by the end of the day."
- (transitive) To arm with mail.
- (transitive) To send (a letter, parcel, etc.) through the mail.
- (transitive) To contact (a person) by electronic mail.
"I need to mail my tutor about the deadline."
- (transitive) To pinion.