What is the meaning of Fast?

Firmly or securely fixed in place; stable.

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

Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)

Moving with great speed, or capable of doing so; swift, rapid.

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).

Of a place, characterised by business, hustle and bustle, etc.

Causing unusual rapidity of play or action.

Able to transfer data in a short period of time.

Deep or sound (of sleep); fast asleep (of people).

Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.

Tenacious; retentive.

Having an extravagant lifestyle or immoral habits.

Ahead of the correct time or schedule.

More sensitive to light than average.

Uncharacteristically mature or promiscuous for one's age.

A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.

Ellipsis of stand fast: a warning not to pass between the arrow and the target.

In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .

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.

To practice religious abstinence, especially from food.

To reduce or limit one's nutrition intake for medical or health reasons, to diet.

To cause a person or animal to abstain, especially from eating.

The act or practice of fasting, religious abstinence from food

One of the fasting periods in the liturgical year

pomp

luxury

firm

solid

tight

fixed

permanent

regular

almost, nearly

imperative of faste

almost; nearly

hardly

extremely, very much

inflection of fasen:

1. second/third-person singular present
2. second-person plural present
3. plural imperative

second/third-person singular present

second-person plural present

plural imperative

strongly, with force

fast (quickly)

solid, steady, firm, fixed, permanent

imperative of faste

solid, steady, firm, fixed, permanent, stuck

solid, firm

splendour, pomp

Alternative form of fastaidh (“hire, employ”)

caught , captured

fixed, fastened, unmoving

firm, solid (as opposed to liquid)

although (short form of fastän)

fixed, firmly, steadily (synonymous to the adjective)

almost, nearly

although, even though

Source: wiktionary.org