The quality or state of being strongly attached; firmness, secureness, tenacity. / The quality or state of moving quickly; quickness, rapidity, swiftness.

plural of fastness

(dated) Firmly or securely fixed in place; stable. / Firm against attack; fortified by nature or art; impregnable; strong.

In a firm or secure manner, securely; in such a way as not to be moved; safe, sound . / (of sleeping) Deeply or soundly . / Immediately following in place or time; close, very near .

(Britain, rail transport) A train that calls at only some stations it passes between its origin and destination, typically just the principal stations

(archery) Short for "stand fast", a warning not to pass between the arrow and the target

(intransitive) To practice religious abstinence, especially from food. / (intransitive) To reduce or limit one's nutrition intake for medical or health reasons, to diet.

The act or practice of fasting, religious abstinence from food / One of the fasting periods in the liturgical year

present participle and gerund of fast

abstinence or mortification for religious reasons, especially abstinence from food / abstinence from food, limiting caloric intake, for medical or health reasons, dieting