Meaning of CO. in English

Co. /kəʊ $ koʊ/ BrE AmE

1 . the abbreviation of company :

James Smith & Co.

2 . and co British English spoken the other members of a particular group of people:

I can’t say I’m looking forward to seeing Angela and co again.

3 . the written abbreviation of county :

Co. Durham

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.