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Definitions

confirmatory

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

The FDA quickly reversed course, agreeing to review Moderna’s application after the company agreed to another confirmatory study in an older age group.

From The Wall Street Journal • Mar. 6, 2026

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

From BBC • Dec. 11, 2025

The best confirmatory follow-up turned out to be a second Galleri test—which is already Grail’s standard approach in its existing sales of Galleri under the FDA exemption for lab-developed blood tests.

From Barron's • Oct. 22, 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