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Definitions

acid test

NOUN
critical test
Synonyms
WEAK
analysis conclusive test crucial test decisive test definitive test experiment genuineness proof proving ground substantiation sure test test of value trial verification

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.

"This was the real acid test here against a team motivated to win and the holders of the competition," he insisted.

From Barron's • Jan. 28, 2026

Single stair, and the fate of Culver City’s ordinance specifically, represents an early California acid test.

From Los Angeles Times • Nov. 23, 2025

But an acid test lies in wait for Celtic against Borussia Dortmund on Tuesday.

From BBC • Sep. 28, 2024

“I think this is going to be the acid test for Morena,” said sociologist Bernardo Barranco.

From Washington Times • Nov. 10, 2023

In chemistry and physics the acid test of one’s understanding of a system is whether one can successfully predict its future behavior.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.