Consecutive.
Anew, repeated, repeatedly, over and over, newly...
Triennial, from Latin "triennium".
The word occurring has three syllables. (Oc-curr-ing)
Series means a collection of books, events, etc. so it is plural automatically.
3
The word is cycle. It means a series of events that are regularly repeated in the same order.
Verbatim
FREQUENT!
enneatical
It is biennial.
The root word of frequency is "frequens," which means "frequent" or "repeated" in Latin.
It is biennial.
metabolic
Contralateral
annual or anniversary
Anew, repeated, repeatedly, over and over, newly...
Repeated and iterated are words that mean done again.