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1.
The language spoken in Bangladesh. It is the 5th most spoken language in the world.
I forgot how to read and write in Bangla because I moved to the US.
by Ahmed Bhuiyan April 02, 2005
 
2.
The language spoken in Bangladesh and the Indian state of West Bengal.

Also known as Bengali.
My parents insisted we speak Bangla in the house. Now I use it to talk to my siblings about people around us, but only if they don't speak it.
by linguaphile August 21, 2006