› UK COMMERCE a small paper or cardboard container used to hold goods, or the contents of the container: an empty cigarette packet He ate a whole packet of biscuits.
› US COMMERCE a very small container for holding a small amount of a liquid, sugar, etc.: a packet of ketchup → Compare sachet
› (US also mailer, UK also postal packet) COMMUNICATIONS a special envelope or container for sending things that can easily break, have an unusual shape, or are very small: In general, cigarettes, alcohol, and aerosols must not be included in postal packets .
› US (UK pack) a collection of documents that have been put together as a set: An information packet is available for customers on request.
› IT a collection of data that has been put together as a set: The X .25 interface breaks the datagrams up into 128-byte packets. All data sent over the internet goes in data packets.
cost/pay/make a packet UK informal › to cost, pay, or earn a lot of money: The advertising campaign must have cost them a packet. He dropped out of university but now he's making a packet in banking. → See also pay packet, postal packet, wage packet