a small group or package of anything

a packet of letters.

Also called packet boat, packet ship. a small vessel that carries mail, passengers, and goods regularly on a fixed route, esp. on rivers or along coasts.

Cards . a part of a pack of cards after being cut.

Informal . a large amount of money.

British Slang .

a painful blow or beating.

misfortune or failure.

to bind up in a package or parcel.