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, especially 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.
verb (used with object)
to bind up in a package or parcel.

1520–30; < Middle French pacquet, equivalent to pacqu(er) to pack1 + -et -et

1. See package. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
packet (ˈpækɪt)
1.  package, Usual US and Canadian word: pack a small or medium-sized container of cardboard, paper, etc, often together with its contents: a packet of biscuits
2.  a small package; parcel
3.  Also called: packet boat a boat that transports mail, passengers, goods, etc, on a fixed short route
4.  slang a large sum of money: to cost a packet
5.  computing See also packet switching a unit into which a larger piece of data is broken down for more efficient transmission
6.  (tr) to wrap up in a packet or as a packet
[C16: from Old French pacquet, from pacquer to pack, from Old Dutch pak a pack]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530, from M.E. pak "bundle" (see pack (n.)) + dim. suffix -et; perhaps modified on Anglo-Fr. pacquet (M.Fr. pacquet), which is ult. a dim. of M.Du. pak. A packet boat (1641) was originally one that carried mails.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

packet definition

The unit of data sent across a network. "Packet" is a generic term used to describe a unit of data at any layer of the OSI protocol stack, but it is most correctly used to describe application layer data units ("application protocol data unit", APDU).
See also datagram, frame.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Then they send the designer an enormous packet of textile samples.
Follow these easy directions to grow your own plants from a packet of seeds.
Dispensing the drug would cost pennies-not much more than the packet of ketchup
  that restaurants already give you for free.
We should have the option to turn on verification of packet origination.
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