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gravitational wave [gravitational waves] (fluctuation in spacetime that propagates as a wave at the speed of light) noun [UK: ˌɡræ.vɪ.ˈteɪʃ.n̩əl weɪv] [US: ˌɡræ.və.ˈteɪʃ.n̩əl ˈweɪv] | undă de gravitațiesubstantiv undă gravitaționalăsubstantiv |