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pen

noun [C] (ENCLOSED SPACE)
 
 
/pen/

Definition

a small area surrounded by a fence, especially one in which animals are kept: a sheep/pig pen → See also playpenAnimal Dwellings - man-madeAnimal dwellings - natural US slang for penitentiary: He served nine years in the state pen.Prisons and parts of prisons
(Definition of pen noun (ENCLOSED SPACE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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