[ kwʌɪə ]
■ noun
1》 four sheets of paper or parchment folded to form eight leaves, as in medieval manuscripts.
2》 any collection of leaves one within another in a manuscript or book.
3》 25 (formerly 24) sheets of paper; one twentieth of a ream.
Origin
ME: from OFr. quaier , from L. quaterni 'set of four'.