dual

/ˈdul/ nom C2

En français : duel

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.

Pluriel duals

Dans la bibliothèque

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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