Countable Nouns Ending in IUM and Containing NN

This list gathers 11 English countable nouns ending in IUM and containing NN, such as Millennium, Biennium, Quadrennium, Decennium, Triennium, Quinquennium and Quadriennium. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

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Starts with B
2 words
biennium
bimillennium
Starts with C
1 words
centennium
Starts with D
1 words
decennium
Starts with M
1 words
millennium
Starts with Q
3 words
quadrennium
quinquennium
quadriennium
Starts with S
2 words
septennium
sexennium
Starts with T
1 words
triennium

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