a person who guards or watches, as at a prison or gate.
a person who assumes responsibility for another's behavior: He refused to be his brother's keeper.
a person who owns or operates a business (usually used in combination): a hotelkeeper.
a person who is responsible for the maintenance of something (often used in combination): a zookeeper; a groundskeeper.
a person charged with responsibility for the preservation and conservation of something valuable, as a curator or game warden.
a person who conforms to or abides by a requirement: a keeper of his word.
a fish that is of sufficient size to be caught and retained without violating the law.
Football. a play in which the quarterback retains the ball and runs with it, usually after faking a hand-off or pass.
something that serves to hold in place, retain, etc., as on a door lock.
something that lasts well, as a fruit.
an iron or steel bar placed across the poles of a permanent horseshoe magnet for preserving the strength of the magnet during storage.

1250–1300; Middle English keper. See keep, -er1

keeperless, adjective
keepership, noun
underkeeper, noun

1. warden, jailer. 2. custodian, guardian. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To keeper
World English Dictionary
keeper (ˈkiːpə)
1.  a person in charge of animals, esp in a zoo
2.  a person in charge of a museum, collection, or section of a museum
3.  a person in charge of other people, such as a warder in a jail
4.  goalkeeper wicketkeeper See gamekeeper
5.  a person who keeps something
6.  a device, such as a clip, for keeping something in place
7.  a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit when it is not in use

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  keeper
Part of Speech:  n
Definition:  See trapper's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Example sentences
We can not be the zoo keeper of the planet and that a bird in a gilded cage is
  still a bird in a cage.
Their choice between holding up a shop keeper or killing an endangered animal
  depends on proximity and ease.
But if you then put it back to constant dark or dim light conditions, it
  immediately reverts to its endogenous time keeper.
It involves various aches and pains and requires a pad, tampon, or keeper to
  prevent any sort of staining on one's clothing.
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