biannual — biennial
“Biannual” (bi-annual — for the right pronunciation, please click here) means ‘something happening (conducted, celebrated or done) twice a year – semi-annual or half-yearly’,
e.g.
It can make quite a difference to my bank savings if the interest is biannual.
[i.e. if the interest is credited to the capital every six months – twice a year]
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“Biennial” (for the right pronunciation of biennial, please click here) means ‘something happening (conducted, celebrated or done) once in every two years – every twenty-four months; the plant that completes its life cycle in two years’,
e.g.
Our meetings are biennial; we meet every other year.
[i.e. if we meet in the year 2017, we do not meet in the year 2018, but will meet in 2019 and then meet again in 2021, and so on]
