Definitions

confirmatory

[kuhn-fur-muh-tawr-ee] / kənˈfɜr məˌtɔr i /

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affirmative adj.
collateral adj.

ADJECTIVE

affirmative

Synonyms

STRONG

affirmatory approving positive supporting

WEAK

acknowledging acquiescent affirming complying concurring confirmative confirming consenting corroborative endorsing favorable ratifying

Antonyms

WEAK

dissenting negative

ADJECTIVE

collateral

Synonyms

STRONGEST

ancillary

STRONG

accessory adjuvant attendant auxiliary complementary concomitant coordinate dependent incident lateral parallel roundabout satellite side sub subordinate subsidiary supporting tributary

WEAK

accompanying added adjunctive appurtenant circuitous coincident concurrent corresponding corroborative not lineal related subservient under

Antonyms

STRONG

chief different dissimilar important independent major necessary unrelated

WEAK

direct main primary principal

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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confirmatory

Simpson said the agency indicated it wouldn’t require new subjects to be dosed for a confirmatory study, only that the original 13 be followed longer to monitor neurocognitive development.

From The Wall Street Journal ● Jun. 22, 2026

If that proves positive, a confirmatory blood test is required - but that can take laboratories weeks to analyse.

From BBC ● Dec. 11, 2025

But in 2022, it said it would withdraw the drug after it failed External link a required confirmatory trial.

From Barron's ● Oct. 24, 2025

"I think the urgency and importance of doing the confirmatory work can't be overstated."

From Science Daily ● Oct. 19, 2025

“Of course not” laughed Robert “Of course not” echoed Mariequita, with a serious, confirmatory bob of the head.

From "The Awakening" by Kate Chopin

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