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.
in chemistry the word polymer means a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers.
Verbatim
FREQUENT!
It is biennial.
artificial
enneatical
Contralateral
metabolic
It is biennial.
annual or anniversary
metabolic