gravity
US /ˈɡræv.ə.t̬i/
UK /ˈɡræv.ə.t̬i/
1.
the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes, gravity is synonymous with the gravitational force, which is the force of attraction between all masses.
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The apple fell from the tree due to gravity.
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The moon's gravity affects the tides on Earth.
2.
extreme importance and seriousness; solemnity
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The doctor explained the gravity of her condition.
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He understood the gravity of the situation and acted quickly.