Definition of a scientific theory: a well-substantiated explanation of some aspect of the natural world, based on a body of knowledge that has been repeatedly confirmed through observation and experiment.
Other modern scientific theories: germ theory, theory of relativity, heliocentrism, atomic theory, plate tectonics, and cell theory.
PS Yes, gravity is a theory. Look up "the theory of gravity" and "Newton's Law Of Gravitation". Also, a theory never becomes a law.
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