Talk:quincentennium

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