Company  n. (pl. -ies) 1 a number of people assembled. B guest(s). 2 person's associate(s). 3 a commercial business. B partners in this. 4 actors etc. Working together. 5 subdivision of an infantry battalion. 6 body of people combined for a common purpose (the ship's company). 7 being with another or others.  in company with together with. Keep a person company remain with a person to be sociable. Part company (often foll. By with) cease to associate; separate; disagree. [french: related to *companion]