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American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A set of 24 or sometimes 25 sheets of paper of the same size and stock; one twentieth of a ream.
2. n. A collection of leaves of parchment or paper, folded one within the other, in a manuscript or book.
3. n. Archaic Variant of choir.

Century Dictionary and Cyclopedia

1. n. A body of singers; a chorus.
2. n. The part of a church allotted to the choristers; the choir.
3. n. A company or assembly.
4. To sing in concert or chorus; chant or sing harmoniously.
5. To harmonize.
6. n. A set of four sheets of parchment or paper folded so as to make eight leaves: the ordinary unit of construction for early manuscripts and books.
7. n. A set of one of each of the sheets of a book laid in consecutive order, ready for folding.
8. n. A book.
9. n. Twenty-four sheets of paper; the twentieth part of a ream.
10. To fold in quires, or with marks between quires.
11. An obsolete form of queer.
12. To nest within a once-folded outer sheet (one or more sheets of paper of the same size similarly folded); impose and print (separate pages of type) so that they can be properly outsetted or insetted in consecutive order.

Wiktionary

1. n. One-twentieth of a ream of paper; a collection of twenty-four or twenty-five sheets of paper of the same size and quality, unfolded or having a single fold.
2. n. bookbinding A set of leaves which are stitched together, originally a set of four pieces of paper (eight leaves, sixteen pages). This is most often a single signature (i.e. group of four), but may be several nested signatures.
3. n. A book, poem, or pamphlet.
4. v. bookbinding To prepare quires by stitching together leaves of paper.
5. n. archaic A choir.
6. n. The architectural part of a church in which the choir resides, between the nave and the sanctuary.
7. v. intransitive To sing in concert.

GNU Webster's 1913

1. n. obsolete See choir.
2. v. rare To sing in concert.
3. n. A collection of twenty-four sheets of paper of the same size and quality, unfolded or having a single fold; one twentieth of a ream.

WordNet 3.0

1. n. a quantity of paper; 24 or 25 sheets