Countable Nouns Ending in IAL and Containing NN

Browse 25 valid English countable nouns ending in IAL and containing NN, from Millennial, Perennial, Biennial, Bicentennial, Quadrennial, Triennial and Decennial to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review singular and plural count rules.

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Starts with B
3 words
biennial
bicentennial
bimillennial
Starts with C
1 words
centennial
Starts with D
2 words
decennial
duodecennial
Starts with M
1 words
millennial
Starts with O
1 words
octennial
Starts with P
2 words
perennial
postmillennial
Starts with Q
7 words
quadrennial
quinquennial
quasquicentennial
quincentennial
quatercentennial
quadricentennial
quindecennial
Starts with S
4 words
sesquicentennial
septennial
semicentennial
sexennial
Starts with T
3 words
triennial
tricentennial
tercentennial
Starts with X
1 words
xennial

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