dual

Etymology

Definitions

1. 1

   Characterized by having two (usually equivalent) components.

   • a dual-motor vehicle
2. 2

   Pertaining to two, pertaining to a pair of.

   • dual engine failure
   • dual citizenship
   • Both Deborah and Samuel held dual roles as judges and prophets.
3. 3

   Pertaining to a grammatical number in certain languages that refers to two of something,…

   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.
4. ›+ 9 more definitionsshow fewer

   1. 4

      Exhibiting duality.

   2. 5

      Being the space of all linear functionals of (some other space).

      • Accordingly, a hyperplane in the sample space is dual to a subspace in the variable space.
   3. 6

      Being the dual of some other category

      Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.

      • Every category is dual to its own dual, so if a statement holds in all categories so does its dual.
   4. 7

      Of an item that is one of a pair, the other item in the pair.

   5. 8

      Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F…

      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.
   6. 9

      The dual number.

   7. 10

      Of a vector in an inner product space, the linear functional corresponding to taking the…

      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.

   8. 11

      A head-to-head match or meet between two teams, such as two high schools or colleges.

      • Wrestling duals and meets take place at the Wisconsin Field House. There are no advance single event ticket sales.
      • But Dave agreed to participate in the Bulgarian dual, and that trapped me into having to wrestle, too.
      • Early in 2021, she became the first female to compete and win a match at the Ter-Hark Cup wrestling dual, helping her squad to victory.
   9. 12

      To convert from single to dual

      To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.

      • I have to declare an interest and I do so with some ambivalence because if the road is dualled it is likely to take half of my front garden.
      • The power generation and propulsion systems are dualled to accommodate component failure and maintain propulsion at reduced speed should any part of one system be lost.
      • The investment will allow Nexus to increase service frequencies, reduce journey times, and improve reliability by dualling three sections of line between Pelaw and South Shields.

The neighborhood

• synonymbinary
• synonymdouble
• synonymdual
• synonymtwin
• synonymtwofold
• neighborplural
• neighborbipartite
• neighbordimerous
• neighborduplex
• neighbordyadic
• neighborbipartible
• neighborbipartile
• neighborunal
• neighborduel