To confine or shut away in a cloister; to seclude or isolate someone from the outside world.
From en- (causative prefix) + cloister (from Old French 'cloistre,' from Latin 'claustrum' meaning enclosed space, from 'claudere' to close).
Medieval writers used 'encloister' to describe the act of becoming a nun or monk—it's not just being in a cloister, it's being put there, emphasizing the separation from normal society.
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