Onsets

An attack; an assault especially of an army.

The initial phase of a disease or condition, in which symptoms first become apparent.

"the onset of schizophrenia"

The initial portion of a syllable, preceding the syllable nucleus.

(acoustics) The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.

To assault; to set upon.

To set about; to begin.