Definition of gravity noun from the Oxford Advanced American Dictionary

     

    gravity

     noun
    noun
    NAmE//ˈɡrævət̮i//
     
    [uncountable]
     
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  1. 1 (abbreviation g) the force that attracts objects in space toward each other, and that on the earth pulls them toward the center of the planet, so that things fall to the ground when they are dropped Newton's law of gravity see also center of gravity
  2. 2 (formal) extreme importance and a cause for worry synonym seriousness I don't think you realize the gravity of the situation. Punishment varies according to the gravity of the offense.
  3. 3 (formal) serious behavior, speech, or appearance They were asked to behave with the gravity that was appropriate in a court of law. see also grave1
See the Oxford Advanced Learner's Dictionary entry: gravity