Related to the ancient Greek philosopher Pythagoras, his followers, or his ideas, especially the Pythagorean theorem in geometry.
From the name *Pythagoras* plus the adjective‑forming suffix *-ean*, meaning 'related to'. Pythagoras led a school of thought that mixed mathematics, philosophy, and even religious rules.
The Pythagorean theorem you learn in school comes from a group that treated numbers almost like sacred beings. They were so serious about math and harmony that they even had rules about what foods to eat, including avoiding beans.
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