parallel postulate

/P EH1 R AH0 L EH0 L P AA0 S CH AH0 L EY0 T/
noun
  1. 1

    (geometry) An axiom in Euclidean geometry: given a straight line L and a point p not on L, there exists exactly one straight line parallel to L that passes through p; a variant of this axiom, such that the number of lines parallel to L that pass through p may be zero or more than one.

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