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

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

Abstinence from food; omission to take nourishment.

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

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

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.

s. hızlı, çabuk, süratli. This is a very fast car. (Bu çok hızlı bir arabadır.)

f. oruç tutmak, perhiz etmek. Muslims fast in Ramadan. (Müslümanlar Ramazan ayında oruç tutarlar.)

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

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.