The average velocity over a very small interval becomes the:

1. Shrinking the time interval gives a value at one moment. 2. Average velocity is measured over an interval of time. 3. Over a small enough interval, the average velocity becomes the instantaneous velocity. 4. That is the velocity at a specific instant. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_