Wiktionary:Word of the day

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Wiktionary's Word of the Day features interesting words, terms, and phrases.

Today's Word of the day

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Word of the day for February 12
gravitational wave n
  1. (physics) A fluctuation in spacetime caused by accelerating mass, which propagates as a wave at the speed of light.
    PointingHand.svg The existence of gravitational waves, predicted by Albert Einstein a century ago, was confirmed yesterday (11 February 2016) by the Laser Interferometer Gravitational-Wave Observatory (LIGO).

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