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- (religion) A denomination of Buddhism elaborated in Japan.
- (religion) Profound meditation within that denomination of Buddhism.
- (informal) A philosophy of calm, reminiscent of that of the Buddhist denomination.
Usually capitalized in all senses, almost always when talking about the denomination proper (compare Catholicism), usually but less often when referring to a looser sense of the philosophy or calm: “That’s very zen.” versus “She studies Zen Buddhism.”