companion /kəmˈpæn.jən/noun 10verb 2forms 3 noun10 •a friend who stays at someone's side, on a journey or through a part of lifeHis dog has been his trusted companion for the last five years. •(old-fashioned) A person employed to accompany or travel with another. •[before a noun] An appended source of media or information, designed to be used in conjunction with and to enhance the main material.The companion guide gives an in-depth analysis of this particular translation. •A celestial object that is associated with another. •(figurative) A person, thing or phenomenon that is closely associated with another person, thing or phenomenon. •A knight of the lowest rank in certain orders. •The covering of a hatchway on an upper deck which leads to the companionway; the stairs themselves. •The framework on the quarterdeck of a sailing ship through which daylight entered the cabins below. •A knot in whose neighborhood another, specified knot meets every meridian disk. •(disapproving, no longer used) A fellow; a rogue.[L]et vs knog our praines together to be reuenge on this same scall scuruy-cogging-companion the Host of the Garter. — 1597 verb2 •(no longer used) To be a companion to; to attend on; to accompany.we had better turn south quickly and compare the elements of education which formed , and of creation which companioned , Salvator . — 1865 •(no longer used) To qualify as a companion; to make equal.Finde me to marrie me with Octauius Caesar, and companion me with my Mistris. — 1606 formscompanioned · companioning · companions