supposition

/ˌsʌpəˈzɪʃən/

//ˌsʌpəˈzɪʃən// noun

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

"supposition" is a 11-letter English headword indexed on PlainSpell.

The verdict

“supposition” has 15 generated spelling variants in the English index at frequency #45,685. The variants make it a useful spelling check.

#45,685
frequency rank, English
54,294
“S” headwords
15
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Something that is supposed; an assumption made to account for known facts, conjecture.

Visual similarity to commonly confused words

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

supposition vs superposition
85% similar

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

Key facts for supposition
PropertyValue
Headwordsupposition
LanguageEnglish
Part of speechNoun
IPA/ˌsʌpəˈzɪʃən/
Letters11
Frequency rank#45,685
Misspellings tracked15
Confusable pairs1
SourceWiktionary (kaikki.org)

Where “supposition” sits in English frequency

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

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 15 spelling variants around supposition (IPA /ˌsʌpəˈzɪʃən/), anoun. Corpus frequency is #45,685 among 54,294 “S” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 15 likely wrong-spelling variants for supposition, with forms such as "spuposition", "ssupposition", and "supopsition". 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 1 confusable-pair relationship, "superposition", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English supposicioun, from Anglo-Norman supposicion, from Latin suppositiō, suppositiōnem (“supposition”), from sub- (“under”) + positiō, positiōnem (“position; theme”), from positus (“position”), from the perfect passive participle of pōnō, pōn… The correct English form is supposition, spelled S-U-P-P-O-S-I-T-I-O-N.

Definition

  1. 1
    Something that is supposed; an assumption made to account for known facts, conjecture.
  2. 2
    The act or an instance of supposing.

Etymology

From Middle English supposicioun, from Anglo-Norman supposicion, from Latin suppositiō, suppositiōnem (“supposition”), from sub- (“under”) + positiō, positiōnem (“position; theme”), from positus (“position”), from the perfect passive participle of pōnō, pōnere (“put, place”).

Synonyms

assumptionconjectureeducated guessforeguessgivenguessguesstimatehunchhypothesisinferenceoverhopepositpossibilitypostulationpresumptionreckoningspeculationsuppositionsurmisesuspiciontheoryworking hypothesis

This word in other languages

suposición(Español)hypothèse(Français)Annahme(Deutsch)suposição(Português)

Common misspellings

Also misspelled as:

  • spuposition
  • ssupposition
  • supopsition
  • suposition
  • suppoistion
  • supposiiton
  • supposision
  • suppositino
  • suppositionn
  • suppositoin
  • supposittion
  • suppossition
  • suppostiion
  • suppsoition
  • uspposition

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of supposition - 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.

spuposition2ssupposition1supopsition2suposition1suppoistion2supposiiton2supposision1suppositino2
Edit distance from "supposition"

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 "supposition"?
"supposition" is spelled S-U-P-P-O-S-I-T-I-O-N. The IPA pronunciation is /ˌsʌpəˈzɪʃən/.
What does "supposition" mean?
As a noun, "supposition" means: Something that is supposed; an assumption made to account for known facts, conjecture.
What words are commonly confused with "supposition"?
"supposition" is commonly confused with "superposition". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "supposition"?
The IPA (International Phonetic Alphabet) transcription for "supposition" is /ˌsʌpəˈzɪʃən/. 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 "supposition"?
From Middle English supposicioun, from Anglo-Norman supposicion, from Latin suppositiō, suppositiōnem (“supposition”), from sub- (“under”) + positiō, positiōnem (“position; theme”), from positus (“position”), from the perfect passive participle of... 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.

Using “supposition”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is S-U-P-P-O-S-I-T-I-O-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ˌsʌpəˈzɪʃən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “superposition” - see the side-by-side comparison. supposition vs superposition
  • Browse more English words and confusable pairs in the same reference. English words

Same frequency band

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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list