The quality or property of having extension or spatial dimension; the degree to which something occupies or spreads through space.
From Latin extensitas, derived from extensus (extended). This is an older or more formal term than the modern equivalent 'extensiveness' or 'extension'.
This word appears in older philosophical and scientific writing, especially from the 18th and 19th centuries—Immanuel Kant famously used it when discussing space and how we experience physical objects!
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