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1. (n.) dark matter
a hypothetical form of matter invisible to electromagnetic radiation, postulated to account for gravitational forces observed in the universe.
Etymology: (1920–25)
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| Definition of 'dark matter' |
Princeton's WordNet |
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1. (noun) dark matter
(cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force
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Definitions of dark matter 
