1. the quality or state of being definite; clarity and certainty in meaning or expression
2. the quality of being final or conclusive; the state of settling a matter beyond doubt

Examples

• The definitiveness of her answer left no room for further debate.
• The court's ruling had a definitiveness that resolved the long-standing dispute.
• He spoke with such definitiveness that everyone believed him immediately.
• The definitiveness of the scientific evidence convinced the skeptics.
• We need more definitiveness in the contract terms before signing.
• The definitiveness of the diagnosis brought both relief and sadness to the family.