Meaning : Consisting of or involving two parts or components usually in pairs.
Example :
An egg with a double yolk.
A double (binary) star.
Double doors.
Dual controls for pilot and copilot.
Duple (or double) time consists of two (or a multiple of two) beats to a measure.
Translation in other languages :
Meaning : Having more than one decidedly dissimilar aspects or qualities.
Example :
A double (or dual) role for an actor.
The office of a clergyman is twofold; public preaching and private influence.
Every episode has its double and treble meaning.
Synonyms : double, three-fold, threefold, treble, two-fold, twofold
Meaning : 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.