observable
UK: əbˈzɜːvəbl̩ | US: əbˈzɜːrvəbl̩
adj. capable of being observed or noticed
adj. (sciences) measurable or detectable
The word "observable" combines "observe," derived from Latin observare ("to watch, heed, guard"), with the suffix "-able," from Latin -abilis ("capable of"). The root "observe" itself comes from ob- (toward) + servare (to keep, guard). Over time, "observable" evolved to describe anything perceptible or measurable, especially in scientific contexts.
The chemical reaction produced observable changes in color.
Stars are only observable through a telescope on cloudy nights.
Her improvement in pronunciation was barely observable.
The study focused on observable behaviors in social interactions.
Quantum particles are not directly observable under normal conditions.