Definitions for radial velocity
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Princeton's WordNet
radial velocity(noun)
velocity along the line of sight toward or away from the observer
Wiktionary
radial velocity(Noun)
motion of a star toward or away from the earth.
Citation
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"radial velocity." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/radial velocity>.

