Sanakirja.org

Määritelmät

Adjektiivi

1. Characterized by having two (usually equivalent) components.
2. Pertaining to two, pertaining to a pair of.
3. (grammar) Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
4. (mathematics, physics) Exhibiting duality.
5. (linear algebra) Being the space of all linear functionals of (some other space).
6. (category theory) Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.

Substantiivi

1. Of an item that is one of a pair, the other item in the pair.
2. (geometry) Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
3. (grammar) The dual number.
4. (mathematics) Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
5. (wrestling) A head-to-head match or meet between two teams, such as two high schools or colleges.

Verbi

1. (transitive) To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.