Latin 'centum' (hundred) + 'annus' (year) — a hundredth anniversary, from PIE *kmtom, itself derived from 'ten tens.'
Of, relating to, or marking a hundredth anniversary; (as noun) a hundredth anniversary or its celebration.
From Latin 'centum' (hundred) + 'annus' (year) + English suffix '-al', after the model of 'biennial' and 'perennial.' Latin 'centum' derives from PIE *ḳm̥tóm (hundred), the reconstructed ancestor of nearly every Indo-European word for one hundred: Greek 'hekaton', Sanskrit 'śatam', Welsh 'cant', Persian 'sad', Russian 'sto'. This is one of the most securely reconstructed PIE numerals
The PIE word for 'hundred' (*ḱm̥tóm) derives from *deḱm̥ (ten) — a hundred was originally 'a great ten' or 'ten tens.' This same PIE root for ten also produced Latin 'decem' (ten), English 'ten,' Greek 'déka,' and Sanskrit 'dáśa.' So 'centennial' contains, buried deep in its first element, the concept of 'ten' multiplied
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