Kosher (adjective)

1. Conforming to Jewish dietary law, particularly in the preparation of food.
2. Conforming to or consistent with the laws or principles of a particular system or ideology.

Origin:

From yiddish "kosher", which means "fit" or "proper", from hebrew "kasher".

Examples:

1. The hotel has a kosher kitchen to cater to Jewish guests.
2. Her ideas are a bit quirky, but they're certainly kosher within the realm of alternative medicine.
3. He's the only rabbi who can certify the kitchen as kosher.
4. He didn't eat anything because he only eats food that is kosher.
5. Her business practices were considered kosher by the industry standards.