1. (noun)onset, oncoming the beginning or early stages Synonyms: onrush, onslaught, oncoming, onset, attack
2. (noun)attack, onslaught, onset, onrush (military) an offensive against an enemy (using weapons) Synonyms: attempt, approach, attack, oncoming, onrush, bombardment, plan of attack, fire, blast, flak, onset, onslaught, tone-beginning, flack, outpouring, barrage
Synonyms, Thesaurus & Antonyms of 'onset'
English Synonyms and Antonyms
1. onset An attack may be by word; an aggression is always by deed. An assault may be upon the person, an aggression is upon rights, possessions, etc. An invasion of a nation's territories is an act Synonyms: attack, aggression, incursion, invasion, onslaught, assault, infringement, onset, trespass, encroachment, intrusion Antonyms: defense, repulsion, resistance, retreat, submission, surrender
Synonyms for onset 
