definition of
[Zen]

[1] #1 Zen n. [Zen Buddhism] school of Mahayana Buddhism asserting that enlightenment can come through meditation and intuition rather than faith; China and Japan. wn

[2] #2 Zen n. [Zen Buddhism] a Buddhist doctrine that enlightenment can be attained through direct intuitive insight. wn

[3] #3 Zen n. [acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane] street name for lysergic acid diethylamide. wn