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nounbeing twofold; a classification into two opposed parts or subclasses
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noun(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
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noun(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
Words sounding like good duality
reality personality morality hospitality sexuality immortality formality mentality brutality homosexuality nationality spirituality mortality speciality municipality sensuality individuality punctuality fatality originality actuality vitality abnormality bestiality normality technicality neutrality immorality sentimentality locality