Definition of demy
plural -es
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
