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.
As with snow blindness, the cause is, paradoxically, too much light—or rather too much focus on what its advocates think of as clearly observable trends. Jason Blakely, Harpers Magazine, 30 Dec. 2025 Photos taken at the Hudong-Zhonghua shipyard show multiple low-observable drone airframes positioned dockside near the People’s Liberation Army Navy’s new Type 076 amphibious assault ship, Sichuan. Aamir Khollam, Interesting Engineering, 30 Dec. 2025 Their work revealed four sets of observable characteristics that correspond to a clear set of genetic markers for each group. The Baltimore Sun, Boston Herald, 30 Dec. 2025 The third traces how those signals in sperm could become epigenetic vectors during and after fertilization to specify observable traits, known as phenotypes, in offspring. Ivan Amato, Quanta Magazine, 22 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 2 Jan. 2026.

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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