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OET→onset

onset

Flag: gbEnglishOxford English Thesaurus
onset
noun
treatment was administered soon after the onset of symptoms:
start, beginning, arrival, (first) appearance, opening, outset, inception;
outbreak, dawn, birth, infancy, genesis, creation, day one, emergence, rise;
formal commencement.
▷antonyms end, termination.
onset Oxford Dictionary of English