'Cycle' is Greek for 'wheel' — the same PIE root produced English 'wheel' and Sanskrit 'chakra.'
A series of events that are regularly repeated in the same order; a complete rotation or revolution; a bicycle or motorcycle.
From Late Latin 'cyclus,' from Greek 'kýklos' (κύκλος, circle, wheel, ring, any circular body or orbit), from PIE *kʷékʷlos (wheel, circle), a reduplicated form from the root *kʷel- (to revolve, to turn, to move around). The PIE word *kʷékʷlos is among the most celebrated reconstructed forms in historical linguistics because it is one of the oldest known technological terms: the word for 'wheel' was coined when the wheel was invented around 3500 BCE and spread with the technology across the Indo-European world. The reduplicated form (*kʷe-kʷl-os) mimics the rolling repetition of a wheel's motion. Cognates
The PIE word *kʷékʷlos (wheel) is one of the most important words in archaeology because it helps date the Proto-Indo-European language. Since the wheel was invented around 3500 BCE and the word is found across almost all IE branches, PIE must have been spoken no earlier than that — the word for wheel could not exist before the wheel itself.