Pythagoras(noun)

Greek philosopher and mathematician who proved the Pythagorean theorem; considered to be the first true mathematician (circa 580-500 BC)

Pythagoras(ProperNoun)

An Ancient Greek mathematician and philosopher

Pythagoras(ProperNoun)

Pythagoras' theorem.

Pythagoras(ProperNoun)

of mostly historical use, and a transliteration from modern Greek.

Pythagoras

a celebrated Greek philosopher and founder of a school named after him Pythagoreans, born at Samos, and who seems to have flourished between 540 and 500 B.C.; after travels in many lands settled at Crotona in Magna Græcia, where he founded a fraternity, the members of which bound themselves in closest ties of friendship to purity of life and to active co-operation in disseminating and encouraging a kindred spirit in the community around them, the final aim of it being the establishment of a model social organisation. He left no writings behind him, and we know of his philosophy chiefly from the philosophy of his disciples.