observable

[ uh b-zur-vuh-buh l ]
/ əbˈzɜr və bəl /

adjective

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for nonobservable

observable


adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for nonobservable

observable

[ əb-zûrvə-bəl ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.