Zen

(noun) school of Mahayana Buddhism asserting that enlightenment can come through meditation and intuition rather than faith; China and Japan. Synonyms: Zen Buddhism.

(noun) a Buddhist doctrine that enlightenment can be attained through direct intuitive insight. Synonyms: Zen Buddhism.

(noun) street name for lysergic acid diethylamide. Synonyms: acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane.