Drift velocity can be defined as

The average velocity of free electron in a conductor on application of potential difference is called Drift velocity

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Drift velocity is defined as the the velocity with which the the electron gets drifted towards the positive terminal of the battery

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Average velocity with which free electron in a conductor get drifted under the enfluence of external E.F

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In physics a drift velocity is the average velocity attained by charged particles, such as electrons, in a material due to an electric field. In general, an electron in a conductor will propagate randomly at the Fermi velocity, resulting in an average velocity of zero. Applying an electric field adds to this random motion a small net flow in one direction; this is the drift. Drift velocity is proportional to current. In a resistive material it is also proportional to the magnitude of an external electric field. Thus Ohm's law can be explained in terms of drift velocity. The law's most elementary expression is: {\displaystyle u=\mu E,} u=\mu E, where u is drift velocity, μ is the material's electron mobility, and E is the electric field. In the MKS system these quantities' units are m/s, m2/(V·s), and V/m, respectively