Added 6 October 2026 extensiveness noun Categories: Describing WordsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about extensiveness at Wordnik → Where our words come from → The degree or property of being extensive. Related Words: broadnessextentextensionbreadthscopeamplitudemagnitudecomprehensivenessvastnessinclusivelengthscale Back to today's word