vicennial
It used to be called a score. So four score and 7 years would be 87 years.
Twenty is the English meaning of the Swahili word ishirini.
Thirty-two and twenty-six.
The Portuguese word for twenty-eight is vinte e oito.
You may be thinking of a "score", as in Lincoln's Gettysburg Address ('Four score and seven years ago' means 87 years ago.)It is also called two decades.
you could say two score...it's old school, but a score is twenty years.
No, we have phases of drought, but it isn't every 20 years.
a score, as in "Four score and seven years..."
Every twenty years
bidecadal
every twenty years?
The word for every 75 years is "septuagesimal."
Quadrenial
The word Biennial means Every two years
Every decade
It used to be called a score. So four score and 7 years would be 87 years.
Something that happens every three years is a triennialevent.