assert

/əˈsɜːt/

//əˈsɜːt// verb

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

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

The verdict

“assert” is a moderately-common English word, ranked #12,544 in English word frequency and used as a verb.

#12,544
frequency rank, English
6
letters
7
tracked misspellings
18
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - To declare with assurance or plainly and strongly; to state positively.

Visual similarity to commonly confused words

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

assert vs asset
83% similar
assert vs asses
67% similar
assert vs avert
67% similar

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

Key facts for assert
PropertyValue
Headwordassert
LanguageEnglish
Part of speechVerb
IPA/əˈsɜːt/
Letters6
Frequency rank#12,544
Misspellings tracked7
Confusable pairs18
SourceWiktionary (kaikki.org)

Where “assert” 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). assert lands here:

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

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

Spelling & Dictionary Insight

The English entry for assert is 6 letters long, classified as a verb, and transcribed in the International Phonetic Alphabet as /əˈsɜːt/. Corpus data places it at rank #12,544 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 7 likely wrong-spelling variants for assert, with forms such as "asert", "asesrt", and "asserrt". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 18 confusable-pair relationships, "asset", "asses", "avert", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Latin assertus, perfect passive participle of asserō (“declare someone free or a slave by laying hands upon him; hence free from, protect, defend; lay claim to, assert, declare”), from ad (“to”) + serō (“join, range in a row”). The correct English form is assert, spelled A-S-S-E-R-T.

Definition

  1. 1
    To declare with assurance or plainly and strongly; to state positively.
  2. 2
    To use or exercise and thereby prove the existence of.
  3. 3
    To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to.
  4. 4
    To insist on the legitimacy of one's rights, opinion, etc; not to allow oneself to be dismissed; to ensure that one is taken into consideration; to make oneself respected; to be assertive. See assert oneself.
  5. 5
    To declare that a condition or expression must be true at a certain point in the source code (in some cases causing the program to fail if it is not, as a safeguard).
  6. 6
    To set a signal on a line using a voltage or electric current.

Etymology

From Latin assertus, perfect passive participle of asserō (“declare someone free or a slave by laying hands upon him; hence free from, protect, defend; lay claim to, assert, declare”), from ad (“to”) + serō (“join, range in a row”).

Antonyms

remitdenydeassert

This word in other languages

asegurar(Español)affirmer(Français)versichern(Deutsch)afirmar(Português)

Common misspellings

Also misspelled as: asert,asesrt,asserrt,assertt,assetr,assret,sasert

Misspelling Pattern Breakdown

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

asert1asesrt2asserrt1assertt1assetr2assret2sasert2
Edit distance from "assert"

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 "assert"?
"assert" is spelled A-S-S-E-R-T. The IPA pronunciation is /əˈsɜːt/.
What does "assert" mean?
As a verb, "assert" means: To declare with assurance or plainly and strongly; to state positively.
What words are commonly confused with "assert"?
"assert" is commonly confused with "asset", "asses", "avert". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "assert"?
The IPA (International Phonetic Alphabet) transcription for "assert" is /əˈsɜːt/. 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 "assert"?
From Latin assertus, perfect passive participle of asserō (“declare someone free or a slave by laying hands upon him; hence free from, protect, defend; lay claim to, assert, declare”), from ad (“to”) + serō (“join, range in a row”). 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 “assert”

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

  • The one correct English spelling is A-S-S-E-R-T - every other letter order is a misspelling in standard orthography.
  • Say it as /əˈsɜːt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “asset” - see the side-by-side comparison. assert vs asset
  • 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.

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

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