conception
moment that something is first thought of
onset
start of something
“the problem onsets when…”
progeny
pro geneeeessee
the children of something that is living
rouse
to stir someone into action
catalyst
a person or thing that triggers significant change or action
vacillate
to alternate repeatedly
vacillate oscillate
eclectic
drawing from a wide range of sources
dynamic
constantly changing
resurgence
a return of popularity after decline
renaissnace
a period of renewed interest or growth