0 together; with -- 一起,共同
1 abbreviation for company (= business) -- 公司(company的縮寫)
Peters, Stynes & Co. 彼得斯和斯泰尼斯公司
2 written abbreviation for county noun , when used in names -- 郡,縣(用於地名,county的縮寫)
Co. Durham 達拉謨郡
Nassau Co. 拿索郡
3 abbreviation for Commanding Officer: a person in charge of a military unit -- 指揮官;司令(Commanding Office的縮寫)
4 written abbreviation for the US state of Colorado: used in addresses -- (美國)科羅拉多州,哥羅拉度州(寫地址時Colorado的縮寫)