The quality or state of having the same extent, range, or boundaries as something else.
From co- (together) + extensive + -ness. The prefix co- comes from Latin, meaning 'with' or 'together.' Extensive comes from Latin extendere (to stretch out). This term developed in logic and philosophy to describe things that apply to exactly the same domain.
In logic, two concepts can be coextensive—meaning they refer to the exact same things—even if they're defined completely differently. For example, 'triangle' and 'three-sided polygon' are coextensive; they mean the same thing about the world even though one definition sounds totally different from the other.
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