1. the quality or state of being extended in space; spatial magnitude or dimension
Usage: formal; philosophy
2. the quality of being stretched out or prolonged in time or duration
Usage: formal

Examples

• Descartes argued that extendedness is a defining property of physical matter.
• The extendedness of the debate made it difficult to reach a quick conclusion.
• The extendedness of the forest across three counties impressed the hikers.
• Philosophers have long debated the nature of extendedness in space.
• The extendedness of the project timeline required careful resource planning.