Longman Dictionary of Contemporary English homepage

perforation

 noun
     
per‧fo‧ra‧tion formal
1 [countable usually plural] a small hole in something, especially one of a line of holes made in a piece of paper so that it can be torn easily:
the perforations in a sheet of stamps
2 [uncountable] when something makes a hole or holes
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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