from
The Collaborative International Dictionary of English v.0.48
Pythagorean \Pyth`a*go"re*an\, a. [L. Pythagoreus, Gr. ?.]
Of or pertaining to Pythagoras (a Greek philosopher, born
about 582 b. c.), or his philosophy.
[1913 Webster]
The central thought of the Pythagorean philosophy is
the idea of number, the recognition of the numerical
and mathematical relations of things. --Encyc. Brit.
[1913 Webster]
{Pythagorean proposition} (Geom.), the theorem that the
square described upon the hypothenuse of a plane
right-angled triangle is equal to the sum of the squares
described upon the other two sides.
{Pythagorean system} (Astron.), the commonly received system
of astronomy, first taught by Pythagoras, and afterward
revived by Copernicus, whence it is also called the
{Copernican system}.
{Pythagorean letter}. See {Y.}
[1913 Webster]