English Reference

Word

affirm

Phoneticsaf·firm, stress on the second syllable

US/əˈfɝm/

UK/ɐfˈɜːm/

Definitions

01to state as true

C1 · Advanced Formal

v. to state strongly and publicly that something is true.

v. to assert something positively or maintain it as true with confidence.

“The spokesperson continued to affirm that the company had done nothing wrong.”

“Throughout the cross-examination, the witness continued to affirm her original statement despite the lawyer's attempts to confuse her.”

Synonyms

Antonyms

02to support or validate

B2 · Upper Intermediate

v. to show that you support a person, a feeling, or a choice.

v. to provide emotional support or validation for a person's identity, experiences, or values.

“It is important for parents to affirm their children's efforts, not just their grades.”

“The therapist worked to affirm the patient's feelings, helping them build the confidence needed to make significant life changes.”

Antonyms

03legal confirmation

C1 · Advanced Law Formal · Technical

v. to officially agree with a legal decision made by a lower court.

v. to confirm or ratify a judgment, decree, or order brought before an appellate court for review.

“The Supreme Court chose to affirm the lower court's decision.”

“The appellate court moved to affirm the original ruling, citing a lack of procedural errors during the initial trial.”

Synonyms

Antonyms

04to promise truth

C2 · Proficiency Law Formal · Technical

v. to make a serious promise to tell the truth in court without swearing a religious oath.

v. to make a solemn declaration under the penalty of perjury, used by those who object to taking a religious oath.

“The witness asked to affirm rather than swear on a Bible.”

“In many jurisdictions, individuals have the right to affirm their testimony if their personal beliefs preclude the taking of a traditional oath.”

Synonyms

05aviation 'yes'

C1 · Advanced Science Technical

interj. a word used in radio communication to mean 'yes' or 'correct'.

interj. a standard procedural word used in radiotelephony to signify an affirmative response, avoiding the phonetic ambiguity of 'yes'.

“The pilot replied 'affirm' when the tower asked if they were ready for takeoff.”

“The air traffic controller waited for the pilot to affirm the heading change before clearing the next aircraft for approach.”

Synonyms

Antonyms

Usage

The verb is transitive and typically takes a direct object or a 'that' clause.

Real-World Examples

“Research published in Science in 2026 examined sycophantic AI : systems that excessively affirm the user's views or behavior, even when challenging them would be more appropriate.”
Phys.org 2 Sept 2026
“Large language models tend to affirm, accommodate and keep users engaged.”
Phys.org 7 Sept 2026

Etymology

From Middle English affermen, from Old French afermer, affermer, from Latin affirmare, adfirmare (“to present as fixed, aver, affirm”), from ad (“to”) + firmare (“to make firm”), from firmus (“firm”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

VERB

affirm(C1)

Domains

AviationLaw

This entry

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 · Advanced
Updated

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English Reference