dual

Dual means double, or having two elements. If you have a dual major, it means you're majoring in two subjects, like astronomy and microbiology.

The adjective dual comes from the Latin duo, for two, and means having two parts. You can have a dual purpose, following two goals at once. To copilot an airplane, you need a cockpit with dual controls. If you're sometimes nasty and sometimes sugar sweet, people might think you have a dual personality. Don't confuse dual, though, with duel, which is a fight between two people.

Definitions of dual
  1. adjective
    consisting of or involving two parts or components usually in pairs
    dual controls for pilot and copilot”
    synonyms: double, duple
    multiple
    having or involving or consisting of more than one part or entity or individual
  2. adjective
    having more than one decidedly dissimilar aspects or qualities
    synonyms: double, three-fold, threefold, treble, two-fold, twofold
    multiple
    having or involving or consisting of more than one part or entity or individual
  3. adjective
    a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural)
    “ancient Greek had the dual form but it has merged with the plural form in modern Greek”
    Synonyms:
    plural
    grammatical number category referring to two or more items or units
Commonly confused words

dual / duel

Seeing double? Not quite! Dual is two, or double, but a duel is a fight. If you’re getting sick of your fair-weather friend’s dual personality, perhaps you should throw down your glove and challenge him to a duel at high noon.

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