the size of the observable universe
scientists often work with phenomena that are not directly observable
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Muchacho Alegre, 2250 Jacksboro Highway, had a score of 19 and was closed because of observable roaches near the stove and issues with water temperature.—Lillie Davidson, Fort Worth Star-Telegram, 24 May 2025 This approach not only reduces risk but also builds confidence across the team through clear, observable progress.—Kunal Abichandani, Forbes.com, 21 May 2025 But this lower end of the galactic scale is still rather murky, in part because the stars that serve as observable tracers of small galaxies can form even smaller structures called star clusters.—Phil Plait, Scientific American, 8 May 2025 While individuals will sometimes swim to the shallows, the squids gather en masse at observable depths during their mating event.—Jules Jacobs, Smithsonian Magazine, 7 May 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
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