Try Our Apps


The Best Internet Slang


[uh b-zur-vuh-buh l] /əbˈzɜr və bəl/
capable of being or liable to be observed; noticeable; visible; discernible:
an observable change in attitude.
worthy or important enough to be celebrated, followed, or observed:
an observable holiday.
deserving of attention; noteworthy.
Origin of observable
1600-10; < Latin observābilis remarkable, equivalent to observā(re) to observe + -bilis -ble
Related forms
observability, observableness, noun
observably, adverb
nonobservable, adjective
nonobservably, adverb
unobservable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for observable
Contemporary Examples
Historical Examples
  • Between the "wondering" and the noun there had been an observable pause.

    Ester Ried Yet Speaking Isabella Alden
  • On the 15th of September, 17—, an unusual stir was observable in our village.

  • The only other observable symptom was slightly increased thirst.

    Pariah Planet Murray Leinster
  • It is observable that he does not absolutely deny that there is an opposite of Being.

    Sophist Plato
  • A tendency to a paradoxical manner of statement is also observable.

    Laws Plato
Word Origin and History for observable

c.1600, from Latin observabilis "remarkable, observable," from observare (see observe). Related: Observably; observability.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
observable in Science
A measurable property of a physical system, such as mass or momentum. In quantum mechanics, observables correspond to mathematical operators used in the calculation of measurable quantities. Operators that do not commute, having a nonzero commutator, correspond to observables that cannot be precisely measured at the same time, such as momentum and position. See also uncertainty principle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for observable

Some English speakers likely know this word

Word Value for observable

Scrabble Words With Friends

Nearby words for observable