Meaning

• A denomination of Buddhism.

• Profound meditation within that denomination of Buddhism.

• An approach to an activity, skill, or subject that emphasizes simplicity and intuition rather than conventional thinking or fixation on goals.

  "the zen of cooking; the zen of passing the bar exam; the zen of C++"

Meaning

• Pertaining to this denomination of Buddhism.

• Enlightened, unburdened and free of worries; chill, extremely relaxed and collected.