（1） The lines or grain in precious stone. （2） Logic， reason; a theme. Theory. （3） The fitness of things; right， as an abstract principle. Truth， reality. （4） Original truth or principle; universal principle. （5） Connected with the prior meaning， this term was invested with a special meaning by the Huayan school， as the underlying "noumenon" or principle of emptiness contained in and which contains all individual phenomena.