False. Definitions do not need to be proven.
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Theorem
Axioms within the system, definitions, theorems "already proven" (not relying upon this theorem directly or indirectly for truth), and logic.
Such statements are called postulates in geometry and axioms in other areas. Definitions are also accepted without proof, but technically they are abbreviations rather than statements.
some seasons in a grasslands are a hot season and a wet season
About 68 miracles have been proven.