thesis

/ˈθiːsɪs/

//ˈθiːsɪs// noun

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

"thesis" is a 6-letter English headword indexed on PlainSpell.

The verdict

“thesis” has 9 generated spelling variants in the English index at frequency #6,636. The variants make it a useful spelling check.

#6,636
frequency rank, English
3,151
“T” headwords
9
tracked misspellings
12
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Senses relating to logic, rhetoric, etc.

Corpus desk

Index EN-thesis · thesis · English

thesis · rank #6,636 · 9 variants · 12 confusables

  • FREQ-COMMON #6,636
  • LEN-LONG 6 letters
  • VOW-2 2 vowels
  • CONFUS-MID 12 pairs
  • VAR-MID 9 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH tent

Nearest frequency peer: tent (-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 “thesis”

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

corpus weight

What this shows “thesis” 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).

thesis vs this
67% similar
thesis vs Tess
50% similar
thesis vs their
67% similar

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

Key facts for thesis
PropertyValue
Headwordthesis
LanguageEnglish
Part of speechNoun
IPA/ˈθiːsɪs/
Letters6
Frequency rank#6,636
Misspellings tracked9
Confusable pairs12
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “thesis”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).thesislands here:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “tent” (#6,635), “tide” (#6,637), “tablet” (#6,634). Among 3,151 “T” headwords, “thesis” is #6,636. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 9 spelling variants around thesis (IPA /ˈθiːsɪs/), anoun. Corpus frequency is #6,636 among 3,151 “T” headwords. Wiktionary lists 7 senses, so context still picks the gloss.

Our generated misspelling index lists 9 likely wrong-spelling variants for thesis, with forms such as "htesis", "tehsis", and "theiss". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 12 confusable-pair relationships, "this", "Tess", "their", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Late Middle English thesis (“lowering of the voice”) and also borrowed directly from its etymon Latin thesis (“proposition, thesis; lowering of the voice”), from Ancient Greek θέσῐς (thésĭs, “arrangement, placement, setting; conclusion, position, thesi… The correct English form is thesis, spelled T-H-E-S-I-S.

Definition

  1. 1
    Senses relating to logic, rhetoric, etc.
  2. 2
    Senses relating to logic, rhetoric, etc.
  3. 3
    Senses relating to logic, rhetoric, etc.
  4. 4
    Senses relating to logic, rhetoric, etc.
  5. 5
    Senses relating to logic, rhetoric, etc.
  6. 6
    Senses relating to music and prosody.
  7. 7
    Senses relating to music and prosody.

Recorded use

Wiktionary examples

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

  1. I submit these nine theses to Wikipedia’s community and to the world. I do this, as Martin Luther said when he posted his famous 95 theses, “Out of love for the truth and the desire to elucidate it.” […] I am confident that every thesis stands on solid ground.
  2. I told them of the grave, becoming, and ſublime deportment they ſhould aſſume upon this myſtical occaſion, and read them two homilies and a theſis of my own compoſing, in order to prepare them.

Etymology

From Late Middle English thesis (“lowering of the voice”) and also borrowed directly from its etymon Latin thesis (“proposition, thesis; lowering of the voice”), from Ancient Greek θέσῐς (thésĭs, “arrangement, placement, setting; conclusion, position, thesis; lowering of the voice”), from τῐ́θημῐ (tĭ́thēmĭ, “to place, put, set; to put down in writing; to consider as, regard”) (ultimately from Proto-Indo-European *dʰeh₁- (“to do; to place, put”)) + -σῐς (-sĭs, suffix forming abstract nouns or nouns of action, process, or result). The English word is a doublet of deed. Sense 1.1 (“proposition or statement supported by arguments”) is adopted from antithesis. Sense 1.4 (“initial stage of reasoning”) was first used by the German philosopher Johann Gottlieb Fichte (1762–1814), and later applied to the dialectical method of his countryman, the philosopher Georg Wilhelm Friedrich Hegel (1770–1831). The plural form theses is borrowed from Latin thesēs, from Ancient Greek θέσεις (théseis).

This word in other languages

tesis(Español)thèse(Français)These(Deutsch)tese(Português)

Common misspellings

Also misspelled as:

  • htesis
  • tehsis
  • theiss
  • thesiss
  • thessi
  • thessis
  • thhesis
  • thseis
  • tthesis

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of thesis - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

htesis2tehsis2theiss2thesiss1thessi2thessis1thhesis1thseis2
Edit distance from "thesis"

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 "thesis"?
"thesis" is spelled T-H-E-S-I-S. The IPA pronunciation is /ˈθiːsɪs/.
What does "thesis" mean?
As a noun, "thesis" means: Senses relating to logic, rhetoric, etc.
What words are commonly confused with "thesis"?
"thesis" is commonly confused with "this", "Tess", "their". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "thesis"?
The IPA (International Phonetic Alphabet) transcription for "thesis" is /ˈθiːsɪs/. 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 "thesis"?
From Late Middle English thesis (“lowering of the voice”) and also borrowed directly from its etymon Latin thesis (“proposition, thesis; lowering of the voice”), from Ancient Greek θέσῐς (thésĭs, “arrangement, placement, setting; conclusion, posit... 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 "thesis", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 6 letters (nearest by frequency rank).

tablet#6,634subway#6,630static#6,629stance#6,627

Similar misspelling depth

Headwords with a similar count of attested misspellings (9 here; floor ≥5).

speeds9 variantsairline9 variantsblonde9 variantsbrooks9 variants

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

Source: FrequencyWords open word-frequency list