Definition of quinternion in US English:

quinternion

noun

Printing
  • A set or gathering of five sheets of paper.

Origin

Mid 17th century; earliest use found in Thomas Urquhart (1611–1660), author and translator. From post-classical Latin quinternio set of five double sheets of paper, i.e. twenty pages from classical Latin quīntus fifth + -ernio (in post-classical Latin quaternio).

Pronunciation

quinternion

/k(w)ɪnˈtəːnɪən/