perforation

noun

• a hole made by boring or piercing:the perforations allow water to enter the well
• a small hole or row of small holes punched in a sheet of paper, e.g. of postage stamps, so that a part can be torn off easily: memos are produced in a continuous strip divided by perforations so that the forms can be detached
• [mass noun] the action or state of perforating or being perforated:there was evidence of intestinal perforation