Meaning of “gravity” - Learner’s Dictionary

gravity

noun [ U ] uk us /ˈɡrævəti/
NATURAL FORCE

the force that makes objects fall to the ground or that pulls objects towards a planet or other body:

the laws of gravity
SERIOUS PROBLEM formal

the quality of being very serious:

You don't seem to realize the gravity of the situation.
→ See also centre of gravity

(Definition of “gravity” from the Cambridge Learner’s Dictionary © Cambridge University Press)