American Heritage® Dictionary of the English Language, Fourth Edition
- n. A ratio expressing the rate of apparent expansion of the universe, equal to the velocity at which a typical galaxy is receding from Earth divided by its distance from Earth.
- n. singular only alternative spelling of Hubble constant.
- n. (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
- After Edwin Powell Hubble. (American Heritage® Dictionary of the English Language, Fourth Edition)
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