observable

adjective

ob·​serv·​able əb-ˈzər-və-bəl 

1

: noteworthy

the trend is observable all over the country

2

: capable of being observed : discernible

the size of the observable universe

observability

əb-ˌzər-və-ˈbi-lə-tē 

noun

observable noun

observably

əb-ˈzər-və-blē 

adverb

Synonyms of observable

• visible
• visual
• noticeable

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

The three larger figures—Starship, governance and Starlink regulation—depend heavily on assumptions about growth businesses whose future cash flows are not directly observable. — Shivaram Rajgopal, Forbes.com, 23 July 2026

DroiClaw aims to create a secure, controllable, and observable AI agent ecosystem by giving users greater oversight of how agents operate. — New Atlas, 23 July 2026

Errant thoughts will still arise (the laundry, the email, the certainty that your opening scene is a disaster) but in a mindful state, those thoughts are observable. — April Dávila, Literary Hub, 22 July 2026

This will spread them out in time so that any additional photons that come from cutting it off are observable. — Chris Lee, ArsTechnica, 22 July 2026

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

Rhymes for observable

• unobservable

Kids Definition

observable

adjective

ob·​serv·​able əb-ˈzər-və-bəl 

: able to be observed : noticeable

observably

-blē 

adverb