n pl , -ties
1 the state or quality of being two or in two parts; dichotomy
2 (Physics) the principle that in microphysics wave theory and corpuscular theory are complementary. The propagation of electromagnetic radiation is analysed using wave theory but its interaction with matter is described in terms of photons. The condition of particles such as electrons, neutrons, and atoms is described in terms of de Broglie waves
3 (Geometry) the interchangeability of the roles of the point and the plane in statements and theorems in projective geometry
English Collins Dictionary - English Definition & Thesaurus
biformity, dichotomy, doubleness, dualism, duplexity, polarity
English Collins Dictionary - English synonyms & Thesaurus
Add your entry in the Collaborative Dictionary.