grav·i·ty 
(gr
ăv
ĭ-t
ē)
n.1. Physics a. The natural attraction between physical bodies, especially when one of the bodies is a celestial body, such as the earth.
b. See gravitation.
2. Grave consequence; seriousness or importance: They are still quite unaware of the gravity of their problems.
3. Solemnity or dignity of manner.
[French gravité, heaviness, from Old French, from Latin gravitās, from gravis, heavy; see gwerə-1 in the Appendix of Indo-European roots.]