Obs. rare. [f. SUPPOSE v. + -URE: cf. composure.] A supposition, hypothesis.

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1613.  Chapman, Rev. Bussy D’Ambois, Plays, 1873, II. 143. There hung a taile Of circumstance so blacke on that supposure That [etc.].

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1663.  Butler, Hud., I. iii. 1322. Thy other Arguments are all Supposures, Hypothetical.

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