1public
2collectively owned
3common
4international (e.g. high seas, metric system, calendar)
5make public
6fair
7just
8Duke, highest of five orders of nobility 五等爵位
9honorable (gentlemen)
10father-in-law
11male (animal)
Examples
tā他qù去le了míng名gǔ古wū屋gōng公gān干。
他去了名古屋公干。
He's gone to Nagoya on business.
去医院要坐哪一路公交？
How can I get to the hospital by bus?
他因公出差到名古屋。
He's gone to Nagoya on business.