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Definition of perforation noun from the Oxford Advanced Learner's Dictionary

perforation

noun
 
/ˌpɜːfəˈreɪʃn/
 
/ˌpɜːrfəˈreɪʃn/
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  1. [countable, usually plural] a small hole in a surface, often one of a series of small holes
    • Tear the sheet of stamps along the perforations.
    • He made a small perforation in the lining of the tube.
  2. [uncountable] (medical) the process of splitting or tearing in such a way that a hole is left
    • Excessive pressure can lead to perforation of the stomach wall.
  3. Word Originlate Middle English: from medieval Latin perforatio(n-), from the verb perforare, from per- ‘through’ + forare ‘pierce’.
See perforation in the Oxford Advanced American Dictionary
halfway
adverb
 
 
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