Word
assertion
Phoneticsas·ser·tion, stress on the second syllable
US/əˈsɝʃən/
UK/ɐsˈɜːʃən/
Definitions
01a strong claim
C1 · Advanced Countable noun Academic · Formal
n. a statement where you say something is true, often with a lot of confidence.
n. a confident and forceful statement of fact or belief, often made without immediate proof.
日本語:断言※
“The lawyer made an assertion that his client was innocent of the crime.”
“The author's central assertion is that economic stability depends more on psychological factors than on physical resources.”
Usage
Often followed by a 'that' clause or the preposition 'of'.
Synonyms
Antonyms
02insisting on a right
C1 · Advanced Uncountable noun Formal
n. the act of making sure your rights or power are recognized.
n. the act of asserting or insisting upon one's rights, authority, or influence.
日本語:主張※
“The small country's assertion of its independence surprised the world.”
“The sudden assertion of executive power by the board led to a series of resignations among the senior management team.”
Synonyms
Antonyms
03programming check
C2 · Proficiency Countable noun Computing Technical
n. a command in a computer program that checks if a condition is true while the code is running.
n. a boolean expression at a specific point in a program which will be true unless there is a bug in the code.
“The programmer added an assertion to make sure the user's age was not a negative number.”
“If the assertion fails during the execution of the test suite, the program will terminate immediately to prevent further data corruption.”
Usage
Commonly used in the context of 'failed assertion' or 'assertion error'.
04audit claim
C2 · Proficiency Countable noun Law Technical · Formal
n. a claim made by a company about its money that an accountant checks.
n. a representation or declaration made by management regarding the recognition, measurement, and presentation of items in financial statements.
“The auditor checked the company's assertion that it owned all the equipment listed.”
“The audit team must obtain sufficient evidence to support management's assertion regarding the valuation of intangible assets.”
Synonyms
Collocations
Common phrases and expressions where native English speakers use the word “assertion” in context.
Verb
01. back up an assertion
“You need to provide empirical evidence to back up your assertion that the economy is recovering.”
verb + prep + noun
02. challenge an assertion
“The defense attorney was quick to challenge the witness's assertion regarding the timeline.”
verb + noun
03. make an assertion
“The scientist was careful not to make any bold assertions before the peer review was complete.”
verb + noun
Adjective
04. baseless assertion
“The company dismissed the allegations as baseless assertions intended to damage their reputation.”
adj + noun
05. startling assertion
“The author makes the startling assertion that modern technology is actually decreasing productivity.”
adj + noun
06. sweeping assertion
“The report was criticized for making sweeping assertions about the entire industry based on one case.”
adj + noun
Noun
07. assertion that-clause
“I dispute his assertion that the project failed due to a lack of funding.”
noun + that-clause
Preposition
08. in support of an assertion
“Several documents were produced in support of the assertion that the contract had been breached.”
prep + noun + prep
Real-World Examples
“The assertion that sex is binary is essentially saying that people are what scientists call sexually dimorphic – that is, the sex-related biological traits of females and males don’t overlap.” “Speaking to reporters on Friday, Trump rejected the assertion that the families of those on board the aircraft carrier are worried about their loved ones.” “Scientists have long pushed back against the assertion that the orcas are attacking vessels, instead suggesting that the behaviour could be a form of play or a means of practising their hunting skills.” Etymology
From Middle English assercioun, from Latin assertiō. By surface analysis, assert + -ion.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
VERB
NOUN
ADJECTIVE
Domains
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
- Frequency
- Frequent
- Level
- C1 · AdvancedOxford
- Updated
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QR code
englishreference.com/q/assertion
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「日本語」 data: JMdict (EDRDG), CC BY-SA 4.0