v = dx/dt (the derivative of 'x' with respect to 't') where 'x' is the displacement of the object
in a given direction, and 't' is time.
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There are several definitions. not just one. Average velocity in a direction = Average displacement (distance) in that direction/time Instantaneous velocity in a direction = derivative of displacement in that direction with respect to time Average velocity in a direction = Initial velocity in that direction + Average acceleration in that direction * time Instantaneous velocity in a direction = Definite integral of acceleration in that direction with respect to time, with initial velocity at t = 0 Then there are others in which time is eliminated.
The formula for velocity is (v = d/t) or (velocity = distance/time).
Velocity is distance / time
velocity = frequency / wavelength, I believe.
Final velocity v = u + at