Co.

Coke's Reports.

Co.

A particle used before other words to imply that the person spoken ofpossesses the same character as other persons whose character ismentioned, as co-executor, and executor with other; co-heir, an heir withothers; co-partner, a partner with others, etc. Co. is also anabbreviation for "company" as John Smith & Co. When so abbreviated, italso represents "county."
Legal Abbreviations Glossary:

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