Etymology
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keeper (n.)

c. 1300 (late 13c. as a surname), "one who has charge of some person or thing, warden," agent noun from keep (v.). Sense of "one who carries on some business" is from mid-15c. Sporting sense (originally cricket) is from 1744. Meaning "something (or someone) worth keeping" is attested by 1999. Brother's keeper is from Genesis iv.9.

updated on September 27, 2016

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Definitions of keeper from WordNet

keeper (n.)
someone in charge of other people;
am I my brother's keeper?
keeper (n.)
one having charge of buildings or grounds or animals;
Synonyms: custodian / steward
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.