The noun gravity means being grave or very serious. In physics, gravity is the natural force that causes things to fall toward the earth.
Someone who conducts themselves with an air of gravity is someone who takes what they are doing seriously. You might be amused to see a three year old serving her dolls tea with an air of gravity appropriate to the Queen of England. Gravity was borrowed through French from Latin gravitās, from gravis "heavy."
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(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
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a manner that is serious and solemn
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