• To abstain from food; to omit to take nourishment in whole or in part; to go hungry. • To practice abstinence as a religious exercise or duty; to abstain from food voluntarily for a time, for the mortification of the body or appetites, or as a token of grief, or humiliation and penitence. • Abstinence from food; omission to take nourishment. • Voluntary abstinence from food, for a space of time, as a spiritual discipline, or as a token of religious humiliation. • A time of fasting, whether a day, week, or longer time; a period of abstinence from food or certain kinds of food; as, an annual fast. • Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door. • Firm against attack; fortified by nature or art; impregnable; strong. • Firm in adherence; steadfast; not easily separated or alienated; faithful; as, a fast friend. • Permanent; not liable to fade by exposure to air or by washing; durable; lasting; as, fast colors. • Tenacious; retentive. • Not easily disturbed or broken; deep; sound. • Moving rapidly; quick in mition; rapid; swift; as, a fast horse. • Given to pleasure seeking; disregardful of restraint; reckless; wild; dissipated; dissolute; as, a fast man; a fast liver. • In a fast, fixed, or firmly established manner; fixedly; firmly; immovably. • In a fast or rapid manner; quickly; swiftly; extravagantly; wildly; as, to run fast; to live fast. • That which fastens or holds; especially, (Naut.) a mooring rope, hawser, or chain; -- called, according to its position, a bow, head, quarter, breast, or stern fast; also, a post on a pier around which hawsers are passed in mooring. • The shaft of a column, or trunk of pilaster.