OED Definition
A. adj.
1.a. Of food, a person’s diet, etc.: conforming to Islamic dietary laws; (of meat) spec. slaughtered and prepared in a way which conforms to these laws.
2. Of behaviour, actions, a commercial product or service, etc.: (designed) in accordance with Islamic law or principles.
Halal is the Arabic word for lawful or permitted.
In a binary context, the term “Halal” is contrasted with “Haram” to designate what is and is not lawful in Islam. Although in the West, the term “Halal” is most often applied to food stuffs, especially meat that has been slaughtered in accordance with Islamic law, it is a word that Muslims around the world use to describe anything which is permissible in Islam.
Halal Meat
The Quran, is the source of what is halal, meaning lawful or permissible and, conversely, what is haram, meaning forbidden.