Answer:

onset

Answer	Crossword Clue
ONSET	Beginning
ONSET	Commencement
ONSET	Start

ONSET	Kickoff
ONSET	Early stages
ONSET	Incipiency
ONSET	Threshold
ONSET	First sign
ONSET	Start or assault
ONSET	Stage at the start
ONSET	Get-go

ONSET	Assault
ONSET	Attack
ONSET	First appearance
ONSET	Git-go
ONSET	First appearance, as of symptoms
ONSET	Inception
ONSET	Dawning
ONSET	First stage

ONSET	Advent
ONSET	Dawn
ONSET	Early stage
ONSET	Opening foray
ONSET	Beginning or attack
ONSET	Initial development
ONSET	First symptoms
ONSET	Genesis

ONSET	First occurrence, as of a symptom
ONSET	Initial stage
ONSET	Day one
ONSET	Starting point
ONSET	Beginning stage
ONSET	Initial indication
ONSET	Initial phase
ONSET	First phase

ONSET	Very beginning
ONSET	Initial symptom
ONSET	Outbreak
ONSET	Earliest stage
ONSET	Coming