extensity

noun
ex·​ten·​si·​ty | \ ik-ˈsten(t)-sə-tē How to pronounce extensity (audio) \
plural extensities

Definition of extensity

1a : the quality of having extension
b : degree of extension : range
2 : an attribute of sensation whereby space or size is perceived

First Known Use of extensity

circa 1834, in the meaning defined at sense 1a

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The first known use of extensity was circa 1834

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