1. A rushing or setting upon; an attack; an assault; a storming; especially, the assault of an army.
  2. The initial phase of a disease or condition, in which symptoms first become apparent.
  3. The initial portion of a syllable, preceding the syllable nucleus.
  4. The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
  5. A setting about; a beginning.
  6. Anything set on, or added, as an ornament or as a useful appendage.


  1. To assault; to set upon.
  2. To set about; to begin.

The above text is a snippet from Wiktionary: onset
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!