Not slow or hesitating; quick in action or perception of any kind.
Prepared for immediate action or use.
Offering itself at once; at hand; opportune; convenient.
Inclined; apt to happen.
Liable at any moment.
ready money; cash
To prepare; to make ready for action.
Greater than the speed of sound (in the same medium, and at the same temperature and pressure).
Ultrasonic, having a frequency too high to be audible.
An aircraft that can travel at the speed of sound.