Definitions
1.nounA small pack or package; a little bundle or parcel"Don't throw the crisp packet on the floor!"
2.nounOriginally, a vessel employed by government to convey dispatches or mails; hence, a vessel employed in conveying dispatches, mails, passengers, and goods, and having fixed days of sailing; a mail boat. Packet boat, ship, vessel (Wikipedia).
3.nounA specimen envelope containing small, dried plants or containing parts of plants when attached to a larger sheet.
4.nounA small fragment of data as transmitted on some types of network, notably Ethernet networks (Wikipedia).
5.nounA plastic bag."2012 August 6, Wendy Knowler, Plastic packets: who bags the profits?"
6.nounA manbulge.
7.nounA large amount of money."It'll cost a packet to fix this."
8.verbTo make up into a packet or bundle.
9.verbTo send in a packet or dispatch vessel.
10.verbTo ply with a packet or dispatch boat.
11.verbTo subject to a denial-of-service attack in which a large number of data packets are sent.