noun
Usage: often capitalized E
: the space to which Euclid's axioms and definitions (as of straight and parallel lines, angles of plane triangles) apply
noun
Usage: often capitalized E
: the space to which Euclid's axioms and definitions (as of straight and parallel lines, angles of plane triangles) apply
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012