Triennial, from Latin "triennium".
Every decade
The word occurring has three syllables. (Oc-curr-ing)
The word is... bicentennial.
Consecutive.
Biennial means "occurring every two years," OR "lasting for two years." The word biannual can also mean "occurring every two years," although its most common meaning is "occurring twice a year."
enneatical
Biannual. Biannual can mean occurring every two years, OR occurring twice a year. Biennial, on the other hand, means only the former: occurring every two years.
Triennial, from Latin "triennium".
Centenary.
Biennial. A biennial event, such as a conference or festival, happens every two years.
"Every day" is an adjective phrase that means occurring each day. "Everyday" is an adjective that means ordinary or commonplace.
Bientum. Coming for the Latin word "Centum" meaning one hundred.
annual or anniversary
The word for every 75 years is "septuagesimal."
Biennial is a word describing an event that happens every two years.
Biennial:Occurring every two years. The Legislature meets biennially. NOTE: Biannual means "occurring twice a year."www.leg.state.or.us/glossary.htmlPlant that completes its life cycle in two years and generally flowers in the second yearnaturesnaturals.co.uk/Botanicals+Glossary