Biannual means occurring twice a year; semiannual: “The Ladakh festival takes place on a biannual basis, once in February and then in August.”
Biennial means ccurring every two years: “Electing for the seat of mayor occurs on a biennial basis.”
Perennial means persistent over a period of several years; continuing without interruption: “The rains have been perennial in this part of the country over the last few years.”
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Ennial is the root word of year ;so different examples containing ennial suffix
1. perennial
Per is the prefix of ” through”,
perennial means ‘ through out the year.’
2.centennial
Cent is prefix of Hundred
So A centennial is defined as a 100th anniversary, or a celebration of a 100th anniversary
Similarly
3.Biennial-
Bi – Prefix for two or twice
Biennial- every twice a year