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From The Collaborative International Dictionary of English v.0.48:
Kosher \Ko"sher\, n. Kosher food; also, a kosher shop. [Webster 1913 Suppl.] 2. the practise of adherence to the Jewish ritual law; used mostly in the phrase keep kosher, v. i.. [PJC] keep kosher To adhere to the rules for eating only kosher food and handling it properly. [PJC]