Centenary (spelling)

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Note that centenary has only one '-n-', unlike millennium. This is because of the original Latin: '-arius' which has the general meaning of 'consisting of [the number of]', and in the context of dates 'consisting of [the number of] years': this has no '-n-'. With centenary, it it is attached to centēnī, 'a hundred [each]', which has only one '-n-'. Therefore the whole word has but a single '-n-'.

Millennium on the other hand is derived form mille, 'thousand', and -ennium, '[period of] years', which comes from the classical Latin annus, 'year'. This has two '-n-'s, and so the derivative also has two'-n-'s.