adjective:

1. Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.
2. Firmly or securely fixed in place; stable.
3. Able to transfer data in a short period of time.
4. Causing unusual rapidity of play or action.
5. Having an extravagant lifestyle or immoral habits.
6. Ahead of the correct time or schedule.
7. Moving with great speed, or capable of doing so; swift, rapid.
8. Tenacious; retentive.
9. More sensitive to light than average.
10. Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).).
11. Having a kinetic energy between 1 million and 20 million electron volts; often used to describe the energy state of free neutrons at the moment of their release by a nuclear fission or nuclear fusion reaction (i.e., before the neutrons have been slowed down by anything).
12. Deep or sound (of sleep); fast asleep (of people).
13. Firm against attack; fortified by nature or art; impregnable; strong.

adverb:

1. Quickly, with great speed; within a short time .
2. In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .
3. Deeply or soundly .
4. Immediately following in place or time; close, very near .
5. Ahead of the correct time or schedule.

noun:

1. The act or practice of abstaining from food or of eating very little food.
2. A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.
3. Initialism of Focused assessment with sonography for trauma.
4. The period of time during which one abstains from or eats very little food.

interjection:

1. Short for "stand fast", a warning not to pass between the arrow and the target.

verb:

1. To restrict one's personal consumption, generally of food, but sometimes other things, in various manners (totally, temporally, by avoiding particular items), often for religious or medical reasons.

name:

1. A surname​.