observable

adjective

ob·​serv·​able əb-ˈzər-və-bəl How to pronounce observable (audio)
Synonyms of observablenext
1
: noteworthy
the trend is observable all over the country
2
: capable of being observed : discernible
the size of the observable universe
observability noun
observable noun
observably adverb

Examples of observable in a Sentence

the size of the observable universe scientists often work with phenomena that are not directly observable
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Min Chun Fu, a 22-year-old founding engineer at Comp AI, a platform that automates evidence gathering, policy checks, and compliance audits through transparent, observable AI workflows, is currently working to incorporate that confidence into the growing AI industry. William Jones, USA Today, 4 Dec. 2025 Repairing the became an urgent task because the B-2 has the unique ability to penetrate the most sophisticated defenses using its low-observable characteristics, as demonstrated in strikes on Iranian underground nuclear facilities in June. Ryan Chan, MSNBC Newsweek, 4 Dec. 2025 Though relatively effective, these observable signs take time to develop, time during which the fish may already be decomposing. Mack Degeurin, Popular Science, 4 Dec. 2025 Though billions of them, born from cosmic events or nuclear reactions, pass through your body every second, neutrinos leave almost no observable trace. Mrigakshi Dixit, Interesting Engineering, 3 Dec. 2025 See All Example Sentences for observable

Word History

Etymology

borrowed from Middle French & Latin; Middle French, "that must or can be observed," borrowed from Latin observābilis "capable of being observed," from observāre "to give attention to, watch carefully, observe" + -bilis "capable (of acting) or worthy of (being acted upon)" — more at -able

First Known Use

1589, in the meaning defined at sense 2

Time Traveler
The first known use of observable was in 1589

Browse Nearby Words

Cite this Entry

“Observable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/observable. Accessed 16 Dec. 2025.

Kids Definition

observable

adjective
ob·​serv·​able əb-ˈzər-və-bəl How to pronounce observable (audio)
: able to be observed : noticeable
observably adverb

More from Merriam-Webster on observable

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