\ də̇mī \
plural -es
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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Merriam-Webster unabridged
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