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. Hence, designating a shop, store, house, etc., where such food is sold or used.
Kosher food; also, a kosher shop.
To prepare in conformity with the requirements of the Jewish law, as meat.
What is it to keep kosher? Is it eating kosher potato chips? Kosher is a bigger idea. I think it's about being healthy. But according to some people, it's about not eating this food because it's forbidden by the Jewish law. My view of the halachah changed a little bit. The laws are there hopefully to be a tool. Matisyahu