One who accompanies or is in company with another for a longer or shorter period, either from choice or casually; one who is much in the company of, or is associated with, another or others; an associate; a comrade; a consort; a partner. "The companions of his fall." "The companion of fools shall smart for it." "Here are your sons again; and I must lose Two of the sweetest companions in the world." "A companion is one with whom we share our bread; a messmate."