If you do not see the Because Meaning in Bengali, then please see the defination of this word "Because". You may understand "Because meaning in Bengali" from defination at English to Bangla online dictionary.
for the reason that; due to the fact that: The boy was absent because he was ill.
Informal. (used directly before a noun, adjective, verb, interjection, etc., to convey a very concise rationale, excuse, or explanation): We’re a little like monkeys because evolution. He doesn’t practice enough: because lazy. I love doughnuts because yum!
because of, by reason of; due to: Schools were closed because of heavy snowfall.
(subordinating) on account of the fact that; on account of being; since: because it's so cold we'll go home
(preposition) because of, on account of: I lost my job because of her