certain
/ˈsɜː.tən/
"certain" is a 7-letter English headword indexed on PlainSpell.
The verdict
“certain” is in the everyday core of English, ranked #707 in English word frequency and used as an adjective.
- #707
- frequency rank, English
- 7
- letters
- 10
- tracked misspellings
- 8
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Sure in one's mind, positive; absolutely confident in the truth of something.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | certain |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˈsɜː.tən/ |
| Letters | 7 |
| Frequency rank | #707 |
| Misspellings tracked | 10 |
| Confusable pairs | 8 |
| Source | Wiktionary (kaikki.org) |
Where “certain” sits in English frequency
Spelling & Dictionary Insight
The English entry for certain is 7 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˈsɜː.tən/. Corpus data places it at rank #707 in overall English word frequency, putting it firmly in the everyday core of the language. Wiktionary records 10 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 10 likely wrong-spelling variants for certain, with forms such as "ccertain", "ceratin", and "cerrtain". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 8 confusable-pair relationships, "Curtin", "contain", "curtain", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: 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 separat… The correct English form is certain, spelled C-E-R-T-A-I-N.
Definition
- 1Sure in one's mind, positive; absolutely confident in the truth of something.
- 2Not to be doubted or denied; established as a fact.
- 3Sure to happen, inevitable; assured.
- 4Unfailing; infallible.
- 5Fixed; regular; determinate.
- 6Particular and definite, but unspecified or unnamed; used to introduce someone or something without going into further detail.
- 7Used 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.
- 8Named but not previously mentioned.
- 9Used before the name of someone famous that people are expected to know.
- 10Determined; resolved.
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”).
Synonyms
Antonyms
This word in other languages
Common misspellings
Also misspelled as: ccertain,ceratin,cerrtain,certainn,certani,certian,certtain,cetrain,cretain,ecrtain
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of certain - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "certain"?
What does "certain" mean?
What words are commonly confused with "certain"?
How do you pronounce "certain"?
What is the origin of the word "certain"?
Is PlainSpell free to use?
Using “certain”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-E-R-T-A-I-N - every other letter order is a misspelling in standard orthography.
- Say it as /ˈsɜː.tən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “Curtin” - see the side-by-side comparison. certain vs Curtin
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.