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quinternion

[kwin-tur-nee-uh n]
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noun Bookbinding.
  1. five gathered sheets folded in two for binding together.
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Origin of quinternion

1645–55; quint- five (< Latin quintus fifth) + -ternion (extracted from quaternion)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018