Zen, a term coming from zen Buddhism (the word itself from dhyana, meaning meditation), means emphasis on meditation that leads to enlightenment; in a wider sense it hints on related things and feelings such as tranquility, spiritual peace, sudden coming to realization and understanding. In hacker speech zen is a very frequent term, according to Jargon file "to zen" means to understand something by simply meditating about it or by sudden realization (as opposed to e.g. active trial and error).
Wikiwikiweb has a related discussion under ZenConcepts.
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