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From WordWeb:

Annual: Occurring or payable every year

What is the corresponding single word for occurring every two year, three year, four year etc.

I understand that it's surely not exhaustively defined for all possible year gap, but how far is it define?

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closed as general reference by Alenanno, kiamlaluno, JoseK, JSBձոգչ, RegDwigнt Jul 29 '11 at 14:13

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

Here are the direct answers to the ones you've asked and a few more.

2 years Biennial
3 years Triennial
4 years Quadrennial
5 years Quinquennial
6 years Sexennial
7 years Septennial
8 years Octennial
9 years Novennial
10 years Decennial

Read here for a list of more yearly multiples

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There's also Sesquiennial in the question Is there a term to describe an event which happens every 18 months. – Alenanno Jul 29 '11 at 10:57
@Alenanno: and you did notice it was I that answered that one too ;) – JoseK Jul 29 '11 at 11:04
ahahah no! I didn't lol – Alenanno Jul 29 '11 at 11:16

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