From the Related Link below: ; bimonthly / semimonthly : Bimonthly is an adjective that means every two months: "I brought the cake for the bimonthly office party." Bimonthlyis also a noun that means a publication issued every two months: "The company publishes several popular bimonthlies." Semimonthly is an adjective that means happening twice a month: "We have semimonthly meetings on the 1st and the 15th."
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According to the online Oxford Dictionaries, "bimonthly" can refer to something occurring every two months or twice in one month. It might be best to just say "every two months" to avoid confusion.
The word is "Biennial".
Something that happens every three years is a triennialevent.
Biennial or biannual can refer to something which happens every two years.
Something that happens every six years is sexennial.