Together; in company — used to indicate accompanying people or things (often in the form '〜共々').
ご家族共々お越しください。
Please come along with your family.
父と母共々昔からの友人だ。
Both my father and mother have been longtime friends (with them).
彼は部下共々プロジェクトを成功させた。
He, together with his subordinates, made the project a success.