onset
[noun]
Synonyms: beginning, inception, outbreak, start

[TahlilGaran] English Synonym Dictionary ▲

on‧set /ˈɒnset $ ˈɑːn-, ˈɒːn-/ noun
the onset of something the beginning of something, especially something bad:
the onset of winter

[TahlilGaran] Dictionary of Contemporary English ▲

onset
noun
ADJ. rapid, sudden the sudden onset of the disease
slow | early | delayed, late
VERB + ONSET delay | mark His first hit record marked the onset of an astonishing career.
PREP. after the ~ after the onset of sleep
at the ~ at the onset of the war
before/prior to the ~, since the ~

[TahlilGaran] Collocations Dictionary ▲

onset

sudden
Consult the doctor if there is a very sudden onset of fever.
abrupt
the abrupt onset of the rainy season in India (=happening very quickly and suddenly)
rapid
Symptoms may include the rapid onset of nausea and vomiting.
early/late onset (=happening earlier or later than commonly happens – used especially about serious illnesses)
The patient had a family history of early onset Alzheimer's disease.
delay the onset of something
An active and healthy lifestyle can delay the onset of disease in later life.
mark the onset of something
The tradition originates from an old Celtic feast marking the onset of winter.

[TahlilGaran] Collocations Dictionary ▲