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
Greek duas, duad-, two, from duo; see dwo- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)