Relating to or characterizing something that extends outward or is directed toward the outside.
From Latin 'extergere' (to wipe out, rub away) combined with '-sive' suffix. The word has rare usage in technical philosophical contexts, emerging in 18th-century writings about spatial properties.
This is a super obscure word that philosophers used when they wanted to distinguish between things pointing inward versus outward—kind of like how porcupine quills are extersive while a snail's shell is introspective!
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