Full Form of CGA are:
1) Controller General of Accounts:
He is the top accounting officer in government of India who looks after the government's accounts and prepares annual account report. Current CGA of government of India is Shri Jawahar Thakur.
2) Color Graphics Adapter:
This is an electronic device which is used in computer CPUs for displaying colors on monitor. It was first built in 1981 by IBM.
3) Computer Graphics Architecture:
It is a term from Information Technology industry.