Talk:quincentennium

Etymology

The OED calls the formation irregular but actually quin- for quinque turns out to be pretty common, particularly in these settings. Compare quindecim where it means 5 with 10 and quingenti where it's five 100s. The irregular part is using quincentennium instead of classical quingentennium, but the soft C means the shift to /g/ isn't natural or understandable any more. — LlywelynII 14:40, 14 January 2024 (UTC)