1) Closure 
• (n.) The state of being without perforation.
Condition of being atretic, occluded, or closed; indicated in compound words by the prefix atreto-or the suffix -atresia. ... Origin: L. Im-neg. + per-foro, pp. -atus, to bore through ... (05 Mar 2000) ... 
Im·per`fo·ra'tion noun [ Confer French imperforation .] The state of being without perforation. 
Type: Term Pronunciation: im-per′fō-rā′shŭn Definitions: 1. Condition of being atretic, occluded, or closed; indicated in compound words by the prefix atreto- or the suffix -atresia.
imperforation 1. A condition in which something is abnormally closed. 2. The state of being without perforation.