Fast

Fast or FAST may refer to:

DEFINITIONS

nounA train that calls at only some stations it passes between its origin and destination, typically just the principal stations
adjectiveFirmly or securely fixed in place; stable.
adjectiveFirm against attack; fortified by nature or art; impregnable; strong.
adverbIn a firm or secure manner, securely; in such a way as not to be moved; safe, sound .
adverb(of sleeping) Deeply or soundly .