per ‧ fo ‧ ra ‧ tion /ˌpɜːfəˈreɪʃ ə n $ ˌpɜːr-/ BrE AmE noun 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