Fast v. i. : To abstain from food; to omit to take nourishment in whole or in part; to go hungry.

Fast v. i. : 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.

Fast v. i. : Abstinence from food; omission to take nourishment.

Fast v. i. : Voluntary abstinence from food, for a space of time, as a spiritual discipline, or as a token of religious humiliation.

Fast v. i. : 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.

Fast v. : Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door.

Fast v. : Firm against attack; fortified by nature or art; impregnable; strong.

Fast v. : Firm in adherence; steadfast; not easily separated or alienated; faithful; as, a fast friend.

Fast v. : Permanent; not liable to fade by exposure to air or by washing; durable; lasting; as, fast colors.

Fast v. : Tenacious; retentive.

Fast v. : Not easily disturbed or broken; deep; sound.

Fast v. : Moving rapidly; quick in mition; rapid; swift; as, a fast horse.

Fast v. : Given to pleasure seeking; disregardful of restraint; reckless; wild; dissipated; dissolute; as, a fast man; a fast liver.

Fast a. : In a fast, fixed, or firmly established manner; fixedly; firmly; immovably.

Fast a. : In a fast or rapid manner; quickly; swiftly; extravagantly; wildly; as, to run fast; to live fast.

Fast n. : 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.

Fast n. : The shaft of a column, or trunk of pilaster.

Example:
How Fast does a catcher need to get serious looks from a D1 college? How do you get Faster?

Taxonomy
meal, food, fast days, body, abstinence, God, Muslims, water fasts, food and drink, Yom Kippur, exception, glucose, meat, women, Roman Catholics, health, prayer, the Church.

Defination from the web:
Fasting is primarily the act of willingly abstaining from some or all food, drink, or both, for a period of time. ... Fasting practices may preclude sexual activity as well as food, in addition to refraining from eating certain types or groups of foods; for example, one might refrain ...