Perforation/ˌpɜːrfəˈreɪʃn/ Definition 1 of 4Pro Tip 1/2Physical Tear Refers to physical damage that makes materials easier to separate by hand. Please, tear the invoice along the perforation carefully. Pro Tip 2/2Intentional Design Perforation in products is often intentional to designate where to split or open them. The box has a perforation to help you open it without scissors.