Definition of demy
1 : a 15th century gold coin of Scotland weighing from 50 to 53 grains
; also : a unit of value equivalent to one demy coin a gold half-demy was issued
2 : a scholar on the foundation at Magdalen college, Oxford, originally receiving half the allowance of a fellow
3 : a size of paper commonly 16 × 21, 151⁄2 × 20, or 171⁄2 × 221⁄2 inches
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Origin and Etymology of demy
Middle English, from demi half — more at demi-
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