What does "observable" mean?

Any physical property that can be observed and measured directly and not derived from other properties

What is a synonym for "observable"?

Common synonyms include: noticeable, apparent, appreciable, axiomatic, beholdable, big.

Pronounced //əbˈzɝ.və.bəl//.

//əbˈzɝ.və.bəl// adj, noun

adj, noun ·Moderate ·College level

Noun

1
Any physical property that can be observed and measured directly and not derived from other properties
"Temperature is an observable but entropy is derived."

Adjective

1
Able to be observed.
"The strange new star was at the edge of the observable universe."
2
Deserving to be observed; worth regarding; remarkable.

Adjective

"Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems."

From observe + -able.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.