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special relativity
(relativity) A theory that (neglecting the effects of gravity) reconciles the principle of relativity with the observation that the speed of light is constant in all frames of reference.
general relativity
(relativity) A theory extending special relativity and uniformly accounting for gravity and accelerated frames of reference, postulating that space-time curves in the presence of mass.
relative clause
(grammar) A subordinate clause that modifies a noun.
relative density
(sciences) A measure of the density of a material. The ratio of the density of a substance to the density of water at the same temperature. It is dimensionless and therefore has no units.
relative superlative
(grammar) the superlative (a degree of comparison) when it is used to express the highest degree of something in relation to something else
relative pins
plural of relative pin
relative pin
(chess) A pin in which moving away the pinned piece would allow capture of a piece other than the king.
relative pressure
non-relatives
plural of non-relative