dual

Meaning

Adj

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

Noun

1. Of an item that is one of a pair, the other item in the pair.
2. Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
3. The dual number.
4. 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.

Verb

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

Synonyms

double

twofold

dual number

binary

duplex

two-fold

duple

pair

twin

duplication

both

couple

👫

diploid

husband and wife

teeth

🦷

threefold

treble

two

two-ply

we

your

yours

three-fold

our

ours

doubled

paired

red

rent

tear

you two

their

dual polyhedron

tooth

🦷

amphimorphic

boy

👦

twinning

duplexing

bipartite

bilobed

two-piece

diad

bilobated

we two

wife

👰‍♀️

you

dualization

twifold

bigeminy

even numbers

dual space

bilobate

edge

even

exclusive

geminate

of those

inclusive

joined

many times

Pronounced as (IPA)

/ˈdjuː.əl/

Etymology

PIE word
*dwóh₁
Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.