a hollow part or piece for receiving and holding some part or thing.
a device intended to hold an electric light bulb mechanically and connect it electrically to circuit wires.
Also called wall socket. a socket placed in a wall to receive a plug that makes an electrical connection with supply wiring.
a hollow in one part that receives another part: the socket of the eye.
the concavity of a joint: the socket of the hip.
verb (used with object)
to place in or fit with a socket.

1300–50; Middle English soket < Anglo-French, equivalent to Old French soc plowshare (< Gaulish *soccos; compare Welsh swch, Old Irish socc) + -et -et

socketless, adjective
unsocketed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
socket (ˈsɒkɪt)
1.  a device into which an electric plug can be inserted in order to make a connection in a circuit
2.  chiefly (Brit) point, Informal Brit names: plug, US and Canadian name: outlet such a device mounted on a wall and connected to the electricity supply
3.  a part with an opening or hollow into which some other part, such as a pipe, probe, etc, can be fitted
4.  a spanner head having a recess suitable to be fitted over the head of a bolt and a keyway into which a wrench can be fitted
5.  anatomy
 a.  a bony hollow into which a part or structure fits: a tooth socket; an eye socket
 b.  the receptacle of a ball-and-socket joint
6.  (tr) to furnish with or place into a socket
[C13: from Anglo-Norman soket a little ploughshare, from soc, of Celtic origin; compare Cornish soch ploughshare]

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

c.1300, "spearhead" (originally one shaped like a plowshare), from Anglo-Fr. soket "spearhead" (c.1260), dim. of O.Fr. soc "plowshare," from V.L. *soccus, probably from a Gaulish source, cf. Welsh swch "plowshare," Middle Irish soc "plowshare," prop. "hog's snout," cognate with L. sus "swine;" see
sow (n.) "female pig." Meaning "hollow part or piece for receiving and holding something" first recorded 1448; anatomical sense is from 1601; domestic electrical sense first recorded 1885. Socket wrench is attested from 1905.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

socket sock·et (sŏk'ĭt)

  1. The concave part of a joint that receives the articular end of a bone.

  2. A hollow or concavity into which a part, such as an eye fits.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

socket definition

The Berkeley Unix mechansim for creating a virtual connection between processes. Sockets interface Unix's standard I/O with its network communication facilities. They can be of two types, stream (bi-directional) or datagram (fixed length destination-addressed messages). The socket library function socket() creates a communications end-point or socket and returns a file descriptor with which to access that socket. The socket has associated with it a socket address, consisting of a port number and the local host's network address.
Unix manual page: socket(2).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The dog nearly yanking my arm out of the socket gets that credit.
Each pole had in the side facing the other a socket into which a smooth
  cross-piece or roller was fitted.
He never spoke, had only one eye and an inflamed socket.
It was a pretty thing, a nickeled cylinder with an almost silvery socket, to be
  attached to the dashboard of his car.
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