observable

adjective

ob·​serv·​able əb-ˈzər-və-bəl How to pronounce observable (audio)
1
2
: capable of being observed : discernible
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.
Phenotype refers to how one’s genetic makeup is expressed in observable traits, including eye color, height and blood type. Gary Robbins, San Diego Union-Tribune, 3 Apr. 2025 Reasonable suspicion testing allows a supervisor to request a drug or alcohol test if there are observable and objective signs that an employee may be under the influence. Johnny C. Taylor Jr., USA TODAY, 25 Mar. 2025 And When To See The Total Lunar Eclipse This total lunar eclipse will be visible across the night side of the world, with the entire event observable from North America. Jamie Carter, Forbes, 4 Mar. 2025 Blame shifts elsewhere, explanations contradict observable reality, and mistakes become someone else’s problem. Nate Bennett, Forbes.com, 26 Mar. 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

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Cite this Entry

“Observable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/observable. Accessed 15 Apr. 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

Last Updated: - Updated example sentences
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