Wordnet 3.0
NOUN (1)
1.
(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer;
the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today;
[syn: Hubble's constant, Hubble constant, Hubble's parameter, Hubble parameter]
WordNet (r) 3.0 (2006):
Hubble constant
n 1: (cosmology) the ratio of the speed of recession of a galaxy
(due to the expansion of the universe) to its distance from
the observer; the Hubble constant is not actually a
constant, but is regarded as measuring the expansion rate
today [syn: Hubble's constant, Hubble constant,
Hubble's parameter, Hubble parameter]