Definition of "as soon as" in English

Conjunction

1. Used other than figuratively or idiomatically: see as,‎ soon.

   • I came as soon as I could.

2. At the moment when; immediately (after); instantly; directly.

   • As soon as he arrived, everyone gasped.

3. Used to indicate that the first action mentioned is as likely as, or is preferred to, the second action mentioned.

   • I'd jump out the window as soon as not.

Preposition

1. Used other than figuratively or idiomatically: see as,‎ soon.

   • He might arrive as soon as three o'clock.