If you mean annual event, it occurs yearly.
An annual event occurs once a year.
The word annual is an adjective. Example: we are having our annual meeting.
Once a year
It is a tri-annual review that begins in January
An investment's annual rate of interest when compounding occurs more often than once a year. Calculated as the following: Consider a stated annual rate of 10%. Compounded yearly, this rate will turn $1000 into $1100. However, if compounding occurs monthly, $1000 would grow to $1104.70 by the end of the year, rendering an effective annual interest rate of 10.47%. Basically the effective annual rate is the annual rate of interest that accounts for the effect of compounding.
Annual event
The Boyne Thunder Annual Boating even is often help on July 12 and 13. Boyne Thunder Annual Boating event provides a fun filled weekend while helping children.
Annual travel insurance is a much better option, even if you don't travel often. Buying insurance each trip is much more costly.
It is annual.
Secondary succession occurs most often
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Something that is annual occurs once every year. It does not refer to something that occurs continually throughout a year. Something that lasts or continues for a long or apparently indefinite time would be called perennial.