theorem

/ˈθiː.ə.ɹəm/

//ˈθiː.ə.ɹəm// noun

By · According to Wiktionary data (CC BY-SA) ·

"theorem" is a 7-letter English headword indexed on PlainSpell.

The verdict

“theorem” has 10 generated spelling variants in the English index at frequency #11,135. The variants make it a useful spelling check.

#11,135
frequency rank, English
3,151
“T” headwords
10
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 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...

Corpus desk

Index EN-theorem · theorem · English

theorem · rank #11,135 · 10 variants · 4 confusables

  • FREQ-MID #11,135
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-MID 4 pairs
  • VAR-MID 10 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH texting

Nearest frequency peer: texting (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “theorem”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “theorem” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

theorem vs there
71% similar
theorem vs theory
71% similar
theorem vs theres
71% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for theorem
PropertyValue
Headwordtheorem
LanguageEnglish
Part of speechNoun
IPA/ˈθiː.ə.ɹəm/
Letters7
Frequency rank#11,135
Misspellings tracked10
Confusable pairs4
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “theorem”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).theoremlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “texting” (#11,134), “Theresa” (#11,136), “Teresa” (#11,133). Among 3,151 “T” headwords, “theorem” is #11,135. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around theorem (IPA /ˈθiː.ə.ɹəm/), anoun. Corpus frequency is #11,135 among 3,151 “T” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

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

  1. 1
    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 part of a bigger theorem's proof are called lemmas.
  2. 2
    A mathematical statement that is expected to be true.
  3. 3
    A syntactically correct expression that is deducible from the given axioms of a deductive system.

Recorded use

Wiktionary example

These source excerpts show how theorem appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Fermat's Last Theorem was known thus long before it was proved in the 1990s.

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.

Synonyms

lemmapropositionstatementconjecturehypothesistheorem

This word in other languages

teorema(Español)théorème(Français)Theorem(Deutsch)teorema(Português)

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.

hteorem2tehorem2theoerm2theoremm1theorme2theorrem1theroem2thheorem1
Edit distance from "theorem"

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 "theorem"?
"theorem" is spelled T-H-E-O-R-E-M. The IPA pronunciation is /ˈθiː.ə.ɹəm/.
What does "theorem" mean?
As a noun, "theorem" means: 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...
What words are commonly confused with "theorem"?
"theorem" is commonly confused with "there", "theory", "theres". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "theorem"?
The IPA (International Phonetic Alphabet) transcription for "theorem" is /ˈθiː.ə.ɹəm/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "theorem"?
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 θ... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "theorem", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

texting#11,134Theresa#11,136sticker#11,127tribune#11,143

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

treaties10 variantswildly10 variantsbananas10 variantscapsule10 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list