- A covered walk with an open colonnade on one side, running along the walls of buildings that face a quadrangle.
- A place, especially a monastery or convent, devoted to religious seclusion; life in such a place.
Etymology: From cloistre, from claustrum, from claudere "to close".
- (intransitive) To become a Roman Catholic religious.
- (transitive) To confine in a cloister, voluntarily or not.
- (intransitive) To deliberately withdraw from worldly things.
- (transitive) To protect or isolate.
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