1. (Material Noun-Neuter) A small opening or materials removed from a solid object. গোটা বস্তুৰ পৰা এটা ক্ষুদ্ৰ অংশ আঁতৰালে হোৱা গাঁত।

English: aperture, cavity, chink, hole, nick, notch, orifice, puncture, ফুটা,
Assamese: খলকি, জলঙা, জলঙ্গা, জলা, দ্বাৰিকা, ফুটা, ফোঁপ, বিন্ধা, সুৰুঙা, সুৰুঙ্গা, ৰেং,
Bodo: अरनाय, गुदुं,
Mising: arung, isur, sirung,
Khasi: ka jingot, ka jingpei, ka thliew,
Garo: bangbanggipa,
Karbi: angkok, angthor,
Nagamese: chet, phuta,
Dimasa: gablah,
Tai: চং, বং,
Deori: চগু, পতি

Lower Magnitude:

a. Material Noun-Neuter: pore, ছিদ্ৰ, লোমকূপ, ৰন্ধ্ৰ, गोथौवै फराय...
b. Material Noun-Neuter: bore, crater, hole, pit, কুণ্ড...
c. Material Noun-Neuter: hollow, ভোমোলা, bangbang, konggrang...

Related Idea:

d. Material Noun-Neuter: gap, hole, lacuna, ফাঁক, ভংলা ...

Sub Idea:

e. Material Noun-Neuter: pore, ছিদ্ৰ, লোমকূপ, ৰন্ধ্ৰ, गोथौवै फराय...

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

English: aperture,
Assamese: মুখবিন্ধা