Peculiar velocity

The term peculiar velocity refers to the components of a receding galaxy's velocity that cannot be explained by Hubble's law.According to Hubble, and as verified by many astronomers, a galaxy is receding from us at a speed proportional to its distance. The relationship between speed and distance would be exact in the absence of other effects.Galaxies are not distributed evenly throughout observable space, but typically found in groups or clusters, ranging in size from fewer than a dozen to several thousands. All these nearby galaxies have a gravitational effect, to the extent that the original galaxy can have a velocity of over 1,000 km/s in an apparently random direction. This velocity will therefore add, or subtract, from the radial velocity that one would expect from Hubble's law.
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Noun
1. velocity with respect to the local standard of rest
(hypernym) speed, velocity

The individual velocity of a star relative to the average velocity of the stars in the solar neighbourhood. Peculiar velocity is also used to describe the velocity of individual galaxies which is not due to the Hubble flow.