dual

/ˈdul/ noun C2

Of an item that is one of a pair, the other item in the pair.
Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces. · The octahedron is the dual of the cube. The icosahedron is the dual of the dodecahedron.
The dual number.
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.
A head-to-head match or meet between two teams, such as two high schools or colleges.

Plural duals

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In his singular character the dual nature alternately asserted itself, and his extreme exactness and astuteness represented, as I have often thought, the reaction against the poetic and contemplative mood which occasionally predominated in him.

The Adventures of Sherlock Holmes, p. 21 · B2

Built in Nova Scotia in 1921, the Bluenose was designed for a dual purpose.

The Legend of the Bluenose, p. 1 · B2

The word in question possessed a dual meaning, simultaneously suggesting a profound melancholy and a tentative, burgeoning sense of hope.

The Faithful Echo, p. 1 · C2

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