What does "certain" mean?
Sure in one's mind, positive; absolutely confident in the truth of something.
Certain
/ˈsɜː.tən/ adj, det, name, pron
adj, det, name, pron ·Very common ·Middle school level
Meaning at a glance
- Primary sense: Sure in one's mind, positive; absolutely confident in the truth of something.
- Grammar: certain is listed as adj, det, name, pron.
- Nearest alternatives: sure, a, a certain, absolute.
- Useful contrasts: circumstantial, impossible, incidental.
- Usage evidence: I wish I could care more about my grades but it seems that, at a certain point of my life, I decided they wouldn't be so important anymore.
How to use "certain"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "certain" 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 "certain" 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 "certain" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "certain" 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 "certain" is acting as adj, det, name, pron 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 "sure" 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 "certain", 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
Adjective
- 1 Sure in one's mind, positive; absolutely confident in the truth of something.
"I was certain of my decision."
- 2 Not to be doubted or denied; established as a fact.
"Now that more experiments have been run, the theory is certain and the argument is settled."
- 3 Sure to happen, inevitable; assured.
"It is certain that Spain will reach the finals. / Spain is now certain to reach the finals. / Spain is now certain of a place in the finals."
- 4 Unfailing; infallible.
"I have often wished, that I knew so certain a remedy in any other disease"
- 5 Fixed; regular; determinate.
"at certain intervals"
Show 5 more definitions
- 6 Particular and definite, but unspecified or unnamed; used to introduce someone or something without going into further detail.
"Every wine has a certain distinctive character which sets it apart from all others."
- 7 Used to denote that the speaker is referring to a specific person or thing that they do not want to name directly, implying that the listener should infer the identity of the referent. euphemistic
"I would have been here on time, but a certain someone lost the car keys!"
- 8 Named but not previously mentioned.
"Looking inside the cover, they learned that the book had once belonged to a certain R. Jones."
- 9 Used before the name of someone famous that people are expected to know.
"Since the last British government to make such a proposal was that of a certain Margaret Thatcher, it might not seem unreasonable."
- 10 Determined; resolved. obsolete
"However I with thee have fixt my Lot, Certain to undergoe like doom[…]"
Adjective
- 1 exercising or taking care great enough to bring assurance wordnet
- 2 established beyond doubt or question; definitely known wordnet
- 3 having or feeling no doubt or uncertainty; confident and assured wordnet
- 4 certain to occur; destined or inevitable wordnet
- 5 definite but not specified or identified wordnet
Show 2 more definitions
- 6 reliable in operation or effect wordnet
- 7 established irrevocably wordnet
Determiner
- 1 Having been determined but not specified.
"Certain people are good at running."
Pronoun
- 1 Unnamed or undescribed members (of). with-of
"She mentioned a series of contracts, of which certain are not cited."
Proper Noun
- 1 A surname.
Synonyms
All synonymsAntonyms
Example
"I wish I could care more about my grades but it seems that, at a certain point of my life, I decided they wouldn't be so important anymore."
Common questions
What is a synonym for "certain"?
Common synonyms include: sure, a, a certain, absolute, absolute improvement, absolute term.
How do you use "certain" in a sentence?
I wish I could care more about my grades but it seems that, at a certain point of my life, I decided they wouldn't be so important anymore.
How do you pronounce "certain"?
Pronounced /ˈsɜː.tən/.
Etymology
From Middle English certeyn, certein, certain, borrowed from Old French certain, from a Vulgar Latin unattested form *certānus, extended form of Latin certus (“fixed, resolved, certain”), of the same origin as cretus, past participle of cernere (“to separate, perceive, decide”). Displaced native Middle English wis, iwis (“certain, sure”) (from Old English ġewiss (“certain, sure”)) and alternative Middle English spelling sertane (“some, certain”).