Definition of demy in English:


(also metric demy)


  • 1[mass noun] A paper size, 564 × 444 mm.

    • ‘All books are in metric Demy format unless otherwise stated.’
    1. 1.1A book size, 216 × 138 mm.
      • ‘The first edition in English, of 1868, was in two volumes demy octavo, the only Murray Darwin to appear in this format, and it occurs in two issues.’
      • ‘Twenty-five large paper copies (22.6 x 14 cm, demy octavo) of Ballads and Sonnets were printed on Whatman's rag paper.’
      • ‘John Ruskin and the Lakeland Arts Revival 1880-1920, a sewn-section demy octavo paperback of 288 pages with a full-colour cover, will be published on 6 April 2004 at £14.95.’
    2. 1.2A book size, 276 × 219 mm.
      • ‘Those who consult bibliographies may need this information to identify books styled as foolscap folio, demy quarto, or with other such expressions of size and format occurring in early sources.’
      • ‘In any press, the most frequently used sizes of pages are demy quarto (1.4), demy octavo (1/8), crown quarto and crown octavo.’


Late Middle English (as an adjective in the sense ‘half-sized’): from demi-, or from its source, French demi half.