Definitions for hubble's constant
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Princeton's WordNet
Hubble's constant, Hubble constant, Hubble's parameter, Hubble parameter(noun)
(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
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"hubble's constant." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/hubble's constant>.