adjective
(dated) Firmly or securely fixed in place; stable.
Firm against attack; fortified by nature or art; impregnable; strong.
(of people) Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)
Moving with great speed, or capable of doing so; swift, rapid; light.
Of a place, characterised by business, hustle and bustle, etc.
Causing unusual rapidity of play or action.
(computing, of a piece of hardware) Able to transfer data in a short period of time.
Deep or sound (of sleep); fast asleep (of people).
(of dyes or colours) Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.
(obsolete) Tenacious; retentive.
(dated) Having an extravagant lifestyle or immoral habits.
(offensive, vernacular, dated, of a girl or young woman) Uncharacteristically mature or promiscuous for one's age.
Ahead of the correct time or schedule.
(of photographic film) More sensitive to light than average.
noun
(British, rail transport) A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.
interjection
(archery) Ellipsis of stand fast, a warning not to pass between the arrow and the target.
adverb
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 .
Quickly, with great speed; within a short time .
Ahead of the correct time or schedule.
verb
(intransitive) To practice religious abstinence, especially from food.
(intransitive) To reduce or limit one's nutrition intake for medical or health reasons, to diet.
(transitive, sciences) To cause (a person or animal) to abstain, especially from eating.
noun
The act or practice of fasting, religious abstinence from food.
Any of the fasting periods in the liturgical year.