Fast, n.
1. Abstinence from food; omission to take nourishment.
Surfeit is the father of much fast. --Shak.
2. Voluntary abstinence from food, for a space of time, as a spiritual discipline, or as a token of religious humiliation.
3. 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 day, a day appointed for fasting, humiliation, and religious offices as a means of invoking the favor of God.
To break one's fast, to put an end to a period of abstinence by taking food; especially, to take one's morning meal; to breakfast.