Definitions from Wiktionary (perforation)

▸ noun:  The act of perforating or the state of being perforated.
▸ noun:  Any opening in a solid object.
▸ noun:  (medicine) An abnormal opening in an organ, such as a rupture.
▸ noun:  A series of holes punched through something in order to assist in separating parts.
▸ noun:  (mathematics) That portion of a surface that remains after an open disk is removed from it.
▸ Also see perforation

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