Extremely chill (3)

I think it could be either:

Which length description are you looking for?:

zen

(Other definitions for zen that I've seen before include "Form of Buddhism that says enlightenment comes through meditation" , "Japanese Buddhism" , "Dibdin detective; Jap. Buddhism" , "Contemplative school" , "Form of Buddhism that says meditation brings enlightenment" .)

I've seen this clue in the LA Times and The Wall Street Journal.

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