Co.
1 Co. is used as an abbreviation for company when it is part of the name of an organization. (BUSINESS)
...the Blue Star Amusement Co.
2 Co. is used as a written abbreviation for county before the names of some counties, especially in Ireland.
...Co. Waterford.
3 You use and co. after someone's name to mean the group of people associated with that person.
INFORMAL
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and co. phrase n-proper PHR
Wayne Hussey and co. will be playing two live sets each evening.