simultaneous
/ˌsɪm.əlˈteɪ̯.ni.əs/
"simultaneous" is a 12-letter English headword indexed on PlainSpell.
The verdict
“simultaneous” is a moderately-common English word, ranked #14,414 in English word frequency and used as an adjective.
- #14,414
- frequency rank, English
- 12
- letters
- 17
- tracked misspellings
- 1
- confusable pair
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Happening at the same moment.
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 | simultaneous |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˌsɪm.əlˈteɪ̯.ni.əs/ |
| Letters | 12 |
| Frequency rank | #14,414 |
| Misspellings tracked | 17 |
| Confusable pairs | 1 |
| Source | Wiktionary (kaikki.org) |
Where “simultaneous” sits in English frequency
Spelling & Dictionary Insight
The English entry for simultaneous is 12 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˌsɪm.əlˈteɪ̯.ni.əs/. Corpus data places it at rank #14,414 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 17 likely wrong-spelling variants for simultaneous, with forms such as "ismultaneous", "simlutaneous", and "simmultaneous". 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 1 confusable-pair relationship, "simultaneously", where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar. The correct English form is simultaneous, spelled S-I-M-U-L-T-A-N-E-O-U-S.
Definition
- 1Happening at the same moment.
- 2To be solved for the same values of variables.
Etymology
From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.
Synonyms
This word in other languages
Common misspellings
Also misspelled as: ismultaneous,simlutaneous,simmultaneous,simulatneous,simulltaneous,simultaenous,simultaneosu,simultaneouss,simultaneuos,simultanneous,simultanoeus,simultnaeous,simulttaneous,simutlaneous,siumltaneous,smiultaneous,ssimultaneous
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of simultaneous - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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 "simultaneous"?
What does "simultaneous" mean?
What words are commonly confused with "simultaneous"?
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What is the origin of the word "simultaneous"?
Is PlainSpell free to use?
Using “simultaneous”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-I-M-U-L-T-A-N-E-O-U-S - every other letter order is a misspelling in standard orthography.
- Say it as /ˌsɪm.əlˈteɪ̯.ni.əs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “simultaneously” - see the side-by-side comparison. simultaneous vs simultaneously
- 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.