quire

1. 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. 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. A book, poem, or pamphlet.

verb

To prepare quires by stitching together leaves of paper.

1. A choir.
2. One quarter of a cruciform church, or the architectural area of a church used by the choir, often near the apse.

verb

To sing in concert.