dual
/ˈdul/ adjective C1- Characterized by having two (usually equivalent) components. · a dual-motor vehicle
- Pertaining to two, pertaining to a pair of. · dual engine failure· dual citizenship
- Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes. · Modern Arabic displays a dual number, as did Homeric Greek.
- Exhibiting duality.
- Being the space of all linear functionals of (some other space).
- Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.
From the library
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.
Built in Nova Scotia in 1921, the Bluenose was designed for a dual purpose.
The word in question possessed a dual meaning, simultaneously suggesting a profound melancholy and a tentative, burgeoning sense of hope.
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