Noun onset has 2 senses
  1. onset, oncoming - the beginning or early stages; "the onset of pneumonia"
    --1 is a kind of start
  2. attack, onslaught, onset, onrush - (military) an offensive against an enemy (using weapons); "the attack began at dawn"
    --2 is a kind of operation, military operation
    --2 has parts: assault
    --2 has particulars:
     ground attack; charge; banzai attack, banzai charge; diversion, diversionary attack; penetration, incursion; blitz; strike; counterattack, countermove; bombing, bombardment; fire, firing; strafe; surprise attack, coup de main
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