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English
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Etymology
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From on- + set. Compare Old Englishonsettan(“to impose; oppress, bear down”). For semantic parallels for the meaning to assault, compare cognate Russianнасе́стьpf(naséstʹ), наседа́тьimpf(nasedátʹ).
(Northern US or cot–caught merger) IPA(key): /ˈɑnˌsɛt/
Hyphenation: on‧set
Noun
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onset (plural onsets)
(medicine) The initial phase of a disease or condition, in which symptoms first become apparent. the onset of schizophrenia
2018 June 25, James Roland, “What is Hypergonadism?”, in Healthline[1]:In mild cases of hypergonadism prior to puberty, the onset of physical and mood changes may not be abnormally early or significant enough to cause any psychological or long-term physical complications.
2022 December 28, Paul Stephen, “Network News: Adrian Shooter CBE: rail industry mourns "a great man"”, in RAIL, number 973, page 6:Widely credited as an early pioneer of the modern railway, Shooter died peacefully of his own choosing in Switzerland on December 13, having bravely lived with the onset of motor neurone disease in the final years of his life.
(phonology) The initial portion of a syllable, preceding the syllable nucleus. Hypernym:anlautHolonym:syllableCoordinate terms:nucleus, coda, rhyme
2025, Cid Swanenvleugel, The Pre-Roman Elements of the Sardinian Lexicon, page 390:The only regular sources for Sardinian *θ are Lat. ci̯ and ti̯, which are absent from Latin onsets. This means that the substantial number of words starting in *θ, discussed in § 3 – 7, cannot regularly continue a Latin form.
(acoustics) The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
A setting about; a beginning. Synonyms:start, beginning; see also Thesaurus:beginningthe onset of puberty
1625, Francis [Bacon], “Of Delays”, in The Essayes[…], 3rd edition, London: […] Iohn Haviland for Hanna Barret, →OCLC:There is surely no greater wisdom than well to time the beginnings and onsets of things.
2013 June 29, “High and wet”, in The Economist, volume 407, number 8842, page 28:Floods in northern India, mostly in the small state of Uttarakhand, have wrought disaster on an enormous scale. The early, intense onset of the monsoon on June 14th swelled rivers, washing away roads, bridges, hotels and even whole villages. Rock-filled torrents smashed vehicles and homes, burying victims under rubble and sludge.
(obsolete) Anything added, such as an ornament or as a useful appendage.
c.1588–1593 (date written), William Shakespeare, “The Lamentable Tragedy of Titus Andronicus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies[…] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene i]:And will with deeds requite thy gentleness:And, for an onset, Titus, to advanceThy name and honourable family,Lavinia will I make my empress.
(archaic) An attack; an assault especially of an army. Synonym:storming
c. 1596 (date written), William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies[…] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act II, scene i]:Heralds, from off our towers, we might beholdFrom first to last, the onset and retireOf both your armies
1800, William Wordsworth, Six thousand Veterans:Who on that day the word of onset gave.
1950, C. S. Lewis, The Lion, the Witch and the Wardrobe:And Peter's tired army cheered, and the newcomers roared, and the enemy squealed and gibbered till the wood re-echoed with the din of that onset.
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