2. Noun. (mathematics) A set of points with all the combinatorial properties of a quadric (a quadric being the set of points of PG(''n'', ''q'') whose coordinates satisfy a quadradic equation). (attention en) ¹
3. Noun. (context: in discussions of the rhythm of written works) ¹
4. Noun. (context: printing) ¹
5. Adjective. (grammar) Referring to four (or more) things; of, in or relating to the quadral grammatical number. ¹
6. Adjective. (mathematics) Of or relating to quadral polynomials. ¹
¹ Source: wiktionary.com