Definitions for "Hubble's Law"
The generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer.
An empirical finding linking the distance of a galaxy and the velocity with which it recedes.
The relationship discovered by Edwin Hubble in the 1920s that shows a linear relationship bewteen the reshift of an non-local galaxy and its recessional velocity. This means that the more distant a galaxy is from us, the faster it is moving away from us . This was a key piece of evidence suggesting an expanding Universe and supporting a Big Bang model.