simultaneous
/ˌsaɪ̯.məlˈteɪ̯.ni.əs/adjective
simultaneous is spelled S-I-M-U-L-T-A-N-E-O-U-S. The wrong spelling people search most is simultanous: about 20 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 40 of all searches for the word. Simultaneous is an adjective meaning “Happening at the same moment”.
How many letters and syllables are in simultaneous?
| Letters | 12: S-I-M-U-L-T-A-N-E-O-U-S |
|---|---|
| Syllables | 5 (from its American pronunciation) |
| In writing | 3.4 times per million words; the 14,307th most frequent word form |
| Wrong spellings searched | 1; the most searched, simultanous, about 20 Bing searches a month (all of them) |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.
How do you spell simultaneous?
Simultaneous is spelled S-I-M-U-L-T-A-N-E-O-U-S. One wrong spelling is searched or written often enough to measure; together they are about 1 in 41 of the searches for simultaneous in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
How common is simultaneous?
Simultaneous appears 3.4 times per million words in written English, the 14,307th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce simultaneous?
- UK /ˌsɪm.əlˈteɪ̯.ni.əs/
- UK /ˌsɪm.əlˈteɪ̯.njəs/
- US /ˌsaɪ̯.məlˈteɪ̯.ni.əs/
Simultaneous has 5 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-simultaneous.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with simultaneous?
5 words on PlainSpell end in the same sounds as simultaneous from its last stressed vowel (/eɪniəs/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
What does simultaneous mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Happening at the same moment.
- 2
To be solved for the same values of variables.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Simultaneous in Spanish, French, German and Portuguese
In the sense occurring at the same time:
| Language | Words |
|---|---|
| French | simultané |
| German | gleichzeitig, simultan |
| Portuguese | simultâneo |
| Spanish | simultáneo |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does simultaneous come from?
From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).