Definitions
1.NounA small pack or package; a little bundle or parcel"Don't throw the crisp packet on the floor!; a packet of letters; a packet of biscuits; a travel bag containing clothing, nightwear and other accessories."
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 protocol data unit of the Internet Protocol.
6.NounA message sent over a transport layer protocol.
7.NounA plastic bag.
8.NounSynonym of package (“male genitalia”).
9.NounA large amount of money."It'll cost a packet to fix this."
10.VerbTo make up into a packet or bundle.
11.VerbTo send in a packet or dispatch vessel.
12.VerbTo ply with a packet or dispatch boat.
13.VerbTo subject to a denial-of-service attack in which a large number of data packets are sent.