Perforation

Definitions

1. The act of perforating or the state of being perforated.
   countable, uncountable
2. Any opening in a solid object.
   countable, uncountable
3. An abnormal opening in an organ, such as a rupture.
   countable, uncountable
4. A series of holes punched through something in order to assist in separating parts.
   countable, uncountable
5. That portion of a surface that remains after an open disk is removed from it.
   countable, uncountable

Equivalents

CEFR level