Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Judaism Conforming to dietary laws; ritually pure: kosher meat.
  • adj. Judaism Selling or serving food prepared in accordance with dietary laws: a kosher restaurant.
  • adj. Slang Legitimate; permissible: "consolidating noneditorial functions of the papers, which is kosher” ( Christian Science Monitor).
  • adj. Slang Genuine; authentic.
  • transitive v. To make proper or ritually pure.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Prepared in accordance with Jewish religious practices.
  • adj. In accordance with standards or usual practice.
  • v. to make kosher.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Ceremonially clean, according to Jewish law; -- applied to food, esp. to meat of animals slaughtered according to the requirements of Jewish law. Opposed to tref. For food to be officially kosher, it must be certified fit to eat by a Rabbi, according to Jewish ritual law.
  • adj. Proper; seemly; appropriate; legitimate.
  • adj. Genuine.
  • n. Kosher food; also, a kosher shop.
  • n. the practise of adherence to the Jewish ritual law; used mostly in the phrase keep kosher, v. i..
  • transitive v. To prepare in conformity with the requirements of the Jewish law, as meat.

from The Century Dictionary and Cyclopedia

  • Pure; clean; lawful; conforming to the requirements of the Talmud: used by Hebrews: as, kosher bread, kosher meat, etc.: opposed to tref.
  • To make ‘kosher,’ or ceremonially correct.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. conforming to dietary laws
  • adj. proper or legitimate
  • n. food that fulfills the requirements of Jewish dietary law

Etymologies

Yiddish kosher, from Ashkenazi Hebrew kóšer, from Hebrew kāšēr, fitting, proper, from kāšēr, to be fitting, to succeed; see kṯr in Semitic roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Yiddish כּשר (kosher), from Hebrew כָּשֵׁר (kashér). (Wiktionary)

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