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{%type%} Definitions

WordNet 3.0Copyright Princeton University
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n. - (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry;

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Usage examples (37)
  • Which will continue to be the case if duality is reality.
  • Neither is mind/brain duality even if you believe otherwise.
  • This duality is immediately apparent in our imaginative life.
  • This duality is really what makes The Dark Knight so riveting.
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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.