observable.
Able to be observed.
Meaning & usage
Able to be observed.
The strange new star was at the edge of the observable universe.
Deserving to be observed; worth regarding; remarkable.
Where this word comes from
Etymology tree English observe Proto-Indo-European *-dʰlom Proto-Italic *-ðlom Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English observable From observe + -able.
Any physical property that can be observed and measured directly and not derived from other properties.
Temperature is an observable but entropy is derived.
In quantum mechanics, observables correspond to Hermitian operators. Also, they act a lot like random variables. Taking their expected value one may recover something resembling a classical observable.
Where this word comes from
Etymology tree English observe Proto-Indo-European *-dʰlom Proto-Italic *-ðlom Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English observable From observe + -able.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.