A group of persons. See Synonyms at band2. One's companions or associates: moved in fast company; is known by the company she keeps. A guest or guests: had company for the weekend. The state of friendly companionship; fellowship: was grateful for her company; friends who finally parted company. A business enterprise; a firm. A partner or partners not specifically named in a firm's title: Lee Rogers and Company. A troupe of dramatic or musical performers: a repertory company. A subdivision of a military regiment or battalion that constitutes the lowest administrative unit. It is usually under the command of a captain and is made up of at least two platoons. A unit of firefighters. A ship's crew and officers. See Usage Note at collective noun. To accompany or associate with.