- a piece of type metal used for filling spaces; a quad
- a rectangular plot of land extensively studied for its ecology
- A size of paper usually 8 x 10 inches (203mm x 254mm). Formed by cutting a large sheet of (say 16 x 20 inches) twice to form 4 pages. The exact size depends upon the original sheet.
- A book size, usually 10 to 13 inches tall and 7.5 to 8.5 inches wide. Intermediate in size between octavo and folio. Abbreviated 4to.
- A group or set of four people or things.<ref name="COED-etym&sense"/>
- (context, mathematics) A four-dimensional hypercomplex number that consists of a real dimension and 3 imaginary ones (i, j, k) that are each a square root of -1. They are commonly used in vector mathematics and three-dimensional games. Quaternion multiplication is the most common technique used by mathematicians to avoid gimbal lock when rotating vectors.<ref name="COED-etym&sense"/>
verb (queries, querying, queried)
- A question or inquiry.
- (computing, databases) A set of instructions passed to a database.
- (transitive) To ask, inquire.
- (intransitive) To ask a question.
- (transitive) To question or call into doubt.
- (computing, databases) To pass a query to a database to retrieve information.
- 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.
- (bookbinding) A set of leaves which are stitched together. This is most often a single signature, but may be several nested signatures.
- (rfv-sense) (italbrac, intransitive) to sing in concert.
- Any of the corner building blocks of a building, usually larger or more ornate than the surrounding blocks.