Definitions
1.nounAn attack; an assault especially of an army.
2.nounThe initial phase of a disease or condition, in which symptoms first become apparent."the onset of schizophrenia"
3.nounThe initial portion of a syllable, preceding the syllable nucleus.
4.noun(acoustics) The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
5.nounA setting about; a beginning."the onset of puberty"
6.nounAnything added, such as an ornament or as a useful appendage.
7.verbTo assault; to set upon.
8.verbTo set about; to begin.