pen - definition of pen by The Free Dictionary
pen 2 (pĕn) n. 1. a. A fenced enclosure for animals. b. The animals kept in such an enclosure. c. Any of various enclosures, such as a bullpen or playpen, used for a variety of purposes. 2. A roofed dock for submarines. tr.v. penned or pent (pĕnt), pen·ni...
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