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[–]adungitit 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 2 fun -  (0 children)

Because those definitions are consistent and based in actual, measurable reality. "A rock is a concreted earthy or mineral matter" and "A rock is dust from unicorn horn shaped into a tree with hands for branches" and "A rock is anything your heart desires, from the sky to worms in the ground", all of these are definitions, but being "definitions" does not make them equally valid.