Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of two objects; a pair.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A pair or couple
  • n. an unordered pair
  • n. dwadasama

from the GNU version of the Collaborative International Dictionary of English

  • n. A union of two; duality.

from The Century Dictionary and Cyclopedia

  • n. Same as dyad.
  • n. In mathematics, an unordered, pair; two objects considered as making up one, and as the same one whichever is taken first.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. two items of the same kind

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Greek duas, duad-, two, from duo; see dwo- in Indo-European roots.

Examples

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