Yes, duality is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
duality
Noun
1. Being twofold; a classification into two opposed parts or subclasses
2. (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
3. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
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Words that can be created with an extra letter added to duality:
M:multiday