Annal ?
It is biennial.
Biennial -sg that happens every alternate year.
The adjective is quadrennial. (extension of 1-annual, 2-biennial, 3-triennial) (The archaic word for a five-year period is a lustrum.)
Pokemon events happen at random points in a year usually to coincide with a special release.
Annal ?
could it be ENTRY ??
could it be ENTRY ??
Annual means once a year. So, they are once a year events.
The word supernova was first used by Fritz Zwicky, a Swiss astrophysicist and astronomer, and was first seen in print in 1926. The word was from the original German, Haupt Nova.This comes from Nova (plural novae) which means "new" in Latin.
Biannual means twice every year.
It means year or yearly for example anniversary this is a Latin root word.
Centenary means the 100th anniversay, which would be the 100th year.
year
While not specifically "by year", chronological means "in order of occurrence in time"
Biannual.
a century