1. [ adjective ] consisting of or involving two parts or components usually in pairs
Synonyms: double duple

"an egg with a double yolk" "a double (binary) star" "double doors" "dual controls for pilot and copilot" "duple (or double) time consists of a multiple of two beats to a measure"

Related terms: multiple
2. [ adjective ] having more than one decidedly dissimilar aspects or qualities
Synonyms: double twofold threefold treble

"a double (or dual) role for an actor" "the office of a clergyman is twofold public preaching and private influence"- R.W.Emerson

Related terms: multiple
3. [ adjective ] (grammar) a grammatical number category referring to two items or units (as opposed to one item (singular) or more than one item (plural))

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

Related terms: plural
Similar spelling:   duly