An archaic or rare term for the act of expanding or the state of being expanded; an expanse.
From Old French 'expansure', derived from Latin 'expansura' (the action of spreading out). This word is largely obsolete, replaced by 'expansion' and 'expanse' in modern English.
Expansure is a ghost word in English—it was used in medieval and early modern texts but gradually disappeared as 'expansion' became the standard term. Language constantly evolves to simplify itself, and when two words mean nearly the same thing, usually only one survives.
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