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Definitions

assay

[a-sey, as-ey, a-sey] / æˈseɪ, ˈæs eɪ, æˈseɪ /
NOUN
analysis
Synonyms
STRONG
appraisal assessment estimation evaluation examination inspection investigation measurement rating survey test trial valuation
Antonyms
STRONG
ignorance neglect
VERB
analyze
Synonyms
STRONG
appraise apprise assess check estimate evaluate examine eyeball inspect investigate measure peg prove rate read see size survey test try valuate value weigh
WEAK
check out size up
Antonyms
STRONG
ignore neglect

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.

To measure individual circadian phases, Prof. Dr. Achim Kramer developed the BodyTime assay.

From Science Daily • Jan. 3, 2026

Dash, whose team includes former software engineers from Moderna, automates common laboratory tests such as Elisa, or enzyme-linked immunosorbent assay, which is used for tasks such as evaluating a drug’s safety and efficacy.

From The Wall Street Journal • Jul. 23, 2025

We set up an inhibition assay in test tubes.

From Salon • Dec. 16, 2024

Remarkably, both MV and MI outperformed menthol in the anti-inflammatory assay.

From Science Daily • May 15, 2024

But when Montaigne used the word it meant an assay or a test.

From "The Invention of Science" by David Wootton

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