Definitions from Wiktionary (onset)

▸ noun:  (archaic) An attack; an assault especially of an army.
▸ noun:  (medicine) The initial phase of a disease or condition, in which symptoms first become apparent.
▸ noun:  (phonology) The initial portion of a syllable, preceding the syllable nucleus.
▸ noun:  (acoustics) The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
▸ noun:  A setting about; a beginning.
▸ noun:  (obsolete) Anything added, such as an ornament or as a useful appendage.
▸ verb:  (obsolete) To assault; to set upon.
▸ verb:  (obsolete) To set about; to begin.
▸ Also see onset

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