aperture (English) [ IPA: ˈæpəˌtʃʊr ASM: এপাৰ্চাৰ]
Contributed by: Rubul Mout (ৰুবুল মাউত) on 2006-08-01
1. (Material Noun-Neuter) A small opening or materials removed from a solid object. গোটা বস্তুৰ পৰা এটা ক্ষুদ্ৰ অংশ আঁতৰালে হোৱা গাঁত।

2. In optics, the aperture of an optical system (including a system consisted of a single lens) is a hole or an opening that primarily limits light propagated through the system. More specifically, the entrance... from wikipedia.org