If the law of free fall were purely definitional, it could not explain why bodies deviate from predicted paths near massive rotating objects, yet general relativity does explain this.

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Deviate(as in whether a player can rationally choose a different action): To break from an expected pattern or strategy; to do something different from what was predicted or planned.
General relativity(as used in physics): Einstein's theory explaining how gravity works by describing space and time as flexible, bendable things affected by massive objects like stars and planets.
definitional(as used in philosophy of language): Serving as a complete and exact explanation of what something is, rather than just a partial description.
explain(Used to distinguish causal explanation from mechanistic explanation in the context of epidemiology.): To account for differences in observed outcomes by reference to a known causal factor, without necessarily specifying the underlying biological or physical mechanism.

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