Italian

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Etymology

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Borrowed from Latin -ennium, from -ennis (annus + -is) + -ium.

Pronunciation

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Suffix

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-ennio m (noun-forming suffix, plural -enni)

  1. (no longer productive) forms nouns from numbers, meaning "period of ~ years"
    mille (a thousand) + ‎-ennio → ‎millennio (millennium)
    dieci (ten) + ‎-ennio → ‎decennio (decade)
    trenta (thirty) + ‎-ennio → ‎trentennio (a period of thirty years)