In the context of proofs, "justify" means to provide a rigorous demonstration that supports a statement or theorem, rather than merely showing an example. Justification requires a comprehensive proof that holds true for all cases, rather than isolated instances. Terms like "substantiate" or "confirm" may imply support but do not equate to justification. Consequently, presenting an example alone is insufficient to justify a theorem. A clear understanding of this distinction is crucial in mathematical discourse.