an independent nonpartisan federal agency that acts as the investigative arm of Congress making the executive branch accountable to Congress and the government accountable to citizens of the United States
"The General Accounting Office, now known as the Government Accountability Office, serves as an independent nonpartisan federal agency that acts as the investigative arm of Congress."
Initialism of Government Accountability Office (or its former name, General Accounting Office).
"Mr. Gao greeted his neighbors at the community center."
A surname.
The word comes from the Mandarin Chinese character gāo, which originally meant "high." It entered English as a transliteration of this term.