If it happens often, it happens commonly.
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if something happens to you it oviesly matters but it depends on what happens to you on what you do.
Biannual or semiannual.
A triennial event happens every three years.
Private servers are non-official copies of the live servers. They are often buggy and out-dated. Please note that these are NON-BLIZZARD servers, if something happens on them Blizzard entertainment can not do anything about it. These servers are illegal.
Something that happens every six years is sexennial.