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.
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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
Since speed or velocity = distance/time ,its dimensional formula =L/T = [MoLT-1]