
Biennial
Event Frequency
Used when describing events that occur with a two-year gap, not annually.

The international summit is a biennial event, not an annual one.
Non-Yearly Plans
Helpful for planning or discussing occurrences that are not part of a yearly schedule.

The committee plans to revise the guidelines on a biennial basis.
Official Occasions
Commonly refers to official, governmental, or formal events and activities.

The biennial budget review draws a lot of media attention.
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