- A rushing or setting upon; an attack; an assault; a
storming; especially, the assault of an army. - A setting about; a beginning. - Anything set on, or added, as an ornament or as a useful
appendage.
2 . Onset
[ v. t.]
- To assault; to set upon. - To set about; to begin.
Meaning of 'onset' (Princeton's WordNet)
1 . onset
[ n]
Meaning (1): - (military) an offensive against an enemy (using weapons)