Meaning of 'dual'

adjective

a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural)

Example: "ancient Greek had the dual form but it has merged with the plural form in modern Greek"

adjective

consisting of or involving two parts or components usually in pairs

Synonyms: double

adjective

having more than one decidedly dissimilar aspects or qualities

Example: "a double (or dual) role for an actor"

Synonyms: double