assertion
/əˈsɜɹʃən/noun
assertion is spelled A-S-S-E-R-T-I-O-N: 9 letters and 3 syllables. It appears 4.3 times per million words in written English, the 12,397th most frequent word form (wordfreq, 2021 data). As a noun, assertion means “The act of asserting; positive declaration or averment” (English Wiktionary, September 2026). The plural of assertion is assertions.
How many letters and syllables are in assertion?
| Letters | 9: A-S-S-E-R-T-I-O-N |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | 4.3 times per million words; the 12,397th most frequent word form |
| Wrong spellings searched | none measured in search |
| 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); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is assertion?
Assertion appears 4.3 times per million words in written English, the 12,397th 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 assertion?
- UK /əˈsɜːʃən/
- US /əˈsɜɹʃən/
- US [əˈsɝʃn̩]
Assertion has 3 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-assertion.ogg, LL-Q1860_(eng)-I_learned_some_phrases-assertion.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with assertion?
3 words on PlainSpell end in the same sounds as assertion from its last stressed vowel (/ɜɹʃən/):
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).
Forms of assertion
- assertions plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does assertion mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The act of asserting; positive declaration or averment.
- 2
Something which is asserted; a declaration; a statement asserted.
You're a man of strong assertions!
- 3
A statement or declaration which lacks support or evidence.
That's just a bare assertion.
- 4
Maintenance; vindication.
the assertion of one's rights or prerogatives
- 5
A statement in a program asserting a condition expected to be true at a particular point, used in debugging.
- 6
The set of information that the statement preparer is providing in a financial statement audit.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Assertion in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | assertion, confirmation , affirmation |
| German | Versicherung, Zusicherung, Behauptung, Beteuerung, Erklärung, Vorbringen |
| Portuguese | asserção, assertiva, afirmação |
| Spanish | aserto, aserción, aseveración |
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 assertion come from?
From Middle English assercioun, from Latin assertiō. By surface analysis, assert + -ion.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).