per‧fo‧ra‧tion /ˌpɜːfəˈreɪʃən $ ˌpɜːr-/ 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

[TahlilGaran] Dictionary of Contemporary English ▲