theorem
/ˈθiː.ə.ɹəm/
"theorem" is a 7-letter English headword indexed on PlainSpell.
The verdict
“theorem” is a moderately-common English word, ranked #11,135 in English word frequency and used as a noun.
- #11,135
- frequency rank, English
- 7
- letters
- 10
- tracked misspellings
- 4
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A mathematical statement of some importance that has been proven to be true. Minor theorems are often called propositions. Theorems which are not very interesting in themselves but are an essential...
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 | theorem |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈθiː.ə.ɹəm/ |
| Letters | 7 |
| Frequency rank | #11,135 |
| Misspellings tracked | 10 |
| Confusable pairs | 4 |
| Source | Wiktionary (kaikki.org) |
Where “theorem” sits in English frequency
Spelling & Dictionary Insight
The English entry for theorem is 7 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈθiː.ə.ɹəm/. Corpus data places it at rank #11,135 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 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 theorem, with forms such as "hteorem", "tehorem", and "theoerm". 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 4 confusable-pair relationships, "there", "theory", "theres", 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 French théorème, from Late Latin theōrēma, from Ancient Greek θεώρημα (theṓrēma, “speculation, proposition to be proved”) (Euclid), from θεωρέω (theōréō, “I look at, view, consider, examine”), from θεωρός (theōrós, “spectator”), from θέα (théa, … The correct English form is theorem, spelled T-H-E-O-R-E-M.
Definition
- 1A mathematical statement of some importance that has been proven to be true. Minor theorems are often called propositions. Theorems which are not very interesting in themselves but are an essential part of a bigger theorem's proof are called lemmas.
- 2A mathematical statement that is expected to be true.
- 3A syntactically correct expression that is deducible from the given axioms of a deductive system.
Etymology
From Middle French théorème, from Late Latin theōrēma, from Ancient Greek θεώρημα (theṓrēma, “speculation, proposition to be proved”) (Euclid), from θεωρέω (theōréō, “I look at, view, consider, examine”), from θεωρός (theōrós, “spectator”), from θέα (théa, “a view”) + ὁράω (horáō, “I see, look”). See also theory, and theater.
This word in other languages
Common misspellings
Also misspelled as: hteorem,tehorem,theoerm,theoremm,theorme,theorrem,theroem,thheorem,thoerem,ttheorem
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of theorem - 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
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Using “theorem”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is T-H-E-O-R-E-M - every other letter order is a misspelling in standard orthography.
- Say it as /ˈθiː.ə.ɹəm/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “there” - see the side-by-side comparison. theorem vs there
- 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.