1 Physics the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton’s laws of gravity apply, with minor modifications to take the general theory of relativity into account.
the degree of intensity of this, measured by acceleration.
2extreme or alarming importance; seriousness:crimes of the utmost gravity
seriousness or solemnity of manner:has the poet ever spoken with greater eloquence or gravity?
late 15th century(sense 2): from Old French, or from Latin gravitas 'weight, seriousness', from gravis 'heavy'. sense 1 dates from the 17th century