Definition of demy in English:

demy

Syllabification: de·my
Pronunciation: /diˈmī
 
/
(in full metric demy)

noun

1A paper size, now standardized at 564 × 444 mm.
More example sentences
  • All books are in metric Demy format unless otherwise stated.
1.1 (in full demy octavo) A book size, now standardized at 216 × 138 mm.
More example sentences
  • In any press, the most frequently used sizes of pages are demy quarto (1/4), demy octavo (1/8), crown quarto and crown octavo.
  • There are many standard formats – Metric Demy Octavo (216 x 138. mm) or Metric Crown Octavo (186 x 123 mm) are common ones.
1.2 (in full demy quarto) A book size, now standardized at 276 × 219 mm.
More example sentences
  • Reg, Following Pat's email, I think the old Hansard sizes were demy quarto but I could be mistaken.
  • The book is very nicely got up by the publisher in format metric demy 4to (280 mm × 216 mm; 11 in × 8.5 in) and expertly set by the author.

Origin

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

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