What does "onset" mean?
The initial phase of a disease or condition, in which symptoms first become apparent.
Onset
/ˈɒnˌsɛt/ noun, verb
noun, verb ·Common ·High school level
Meaning at a glance
- Primary sense: The initial phase of a disease or condition, in which symptoms first become apparent.
- Grammar: onset is listed as noun, verb.
- Nearest alternatives: a, access, activating, acute illness onset event.
- Useful contrasts: ultimate, cessation, cessations.
- Usage evidence: Due to the early onset of winter this year, authorities are forecasting shortages of heating oil.
How to use "onset"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "onset" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "onset" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "onset" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "onset" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "onset" is acting as noun, verb in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "a" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "onset", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 The initial phase of a disease or condition, in which symptoms first become apparent.
"the onset of schizophrenia"
- 2 (military) an offensive against an enemy (using weapons) wordnet
- 3 The initial portion of a syllable, preceding the syllable nucleus.
"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."
- 4 the beginning or early stages wordnet
- 5 The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
Show 3 more definitions
- 6 A setting about; a beginning.
"the onset of puberty"
- 7 Anything added, such as an ornament or as a useful appendage. obsolete
"And will with deeds requite thy gentleness: And, for an onset, Titus, to advance Thy name and honourable family, Lavinia will I make my empress."
- 8 An attack; an assault especially of an army. archaic
"Heralds, from off our towers, we might behold From first to last, the onset and retire Of both your armies"
Verb
- 1 To assault; to set upon. obsolete
- 2 To set about; to begin. obsolete
Synonyms
All synonymsAntonyms
Example
"Due to the early onset of winter this year, authorities are forecasting shortages of heating oil."
Common questions
What is a synonym for "onset"?
Common synonyms include: a, access, activating, acute illness onset event, advent, advents.
How do you use "onset" in a sentence?
Due to the early onset of winter this year, authorities are forecasting shortages of heating oil.
How do you pronounce "onset"?
Pronounced /ˈɒnˌsɛt/.
Etymology
From on- + set. Compare Old English onsettan (“to impose; oppress, bear down”). For semantic parallels for the meaning to assault, compare cognate Russian насе́сть pf (naséstʹ), наседа́ть impf (nasedátʹ).