WordReference Random House Unabridged Dictionary of American English © 2026
par′allel pos′tulate, [Geom.]
  1. Mathematicsthe axiom in Euclidean geometry that only one line can be drawn through a given point so that the line is parallel to a given line that does not contain the point. Also called parallel axiom. 

'parallel postulate' also found in these entries (note: many are not synonyms or translations):
hyperbolic geometry - parallel axiom - Riemannian geometry

Forum discussions with the word(s) "parallel postulate" in the title:


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