airspeed - the speed of an aircraft relative to the air in which it is flying

escape velocity - the minimum velocity needed to escape a gravitational field

groundspeed - the speed of an aircraft relative to the ground

hypervelocity - excessive velocity; "the meteorites struck the earth with hypervelocity impacts"

muzzle velocity - the velocity of a projectile as it leaves the muzzle of a gun

peculiar velocity - velocity with respect to the local standard of rest

radial velocity - velocity along the line of sight toward or away from the observer

light speed, speed of light, c - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second

steerageway - (nautical) the minimum rate of motion needed for a vessel to be maneuvered

terminal velocity - the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

rate - a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"