Definitions of company:

• noun:   an institution created to conduct business

  Example: "He started the company in his garage"

• noun:   a unit of firefighters including their equipment

  Example: "A hook-and-ladder company"

• noun:   a social gathering of guests or companions

  Example: "The house was filled with company when I arrived"

• noun:   organization of performers and associated personnel (especially theatrical)

  Example: "The traveling company all stayed at the same hotel"

• noun:   small military unit; usually two or three platoons
• noun:   the state of being with someone

  Example: "He missed their company"

• noun:   crew of a ship including the officers; the whole force or personnel of a ship
• noun:   a band of people associated temporarily in some activity

  Example: "The company of cooks walked into the kitchen"

• noun:   a social or business visitor

  Example: "The room was a mess because he hadn't expected company"

• verb:   be a companion to somebody