com·pa·ny 
(kŭmpə-nē)
(kŭmpə-nē)n. pl. com·pa·nies
1. A group of persons: a company of scientists.
2.
a. One's companions or associates: moved in fast company; is known by the company she keeps.
b. A guest or guests: had company for the weekend.
c. The state of friendly companionship; fellowship: was grateful for her company; friends who finally parted company.
3.
a. A business enterprise; a firm.
b. A partner or partners not specifically named in a firm's title: Lee Rogers and Company.
4. A troupe of dramatic or musical performers: a repertory company.
5.
a. 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.
b. A unit of firefighters.
6. A ship's crew and officers. See Usage Note at collective noun.
v. com·pa·nied, com·pa·ny·ing, com·pa·nies
v.tr.
To accompany or associate with.
v.intr.
To keep company with someone; associate.
[Middle English compainie, from Old French compaignie, from Vulgar Latin *compānia, from *compāniō, companion; see COMPANION1.]