·noun A setting about; a beginning.
II. Onset ·vt To set about; to Begin.
III. Onset ·vt To Assault; to set upon.
IV. Onset ·noun Anything set on, or added, as an ornament or as a useful appendage.
V. Onset ·noun A rushing or setting upon; an attack; an assault; a storming; especially, the assault of an Army.