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.

1600–10; < Latin observābilis remarkable, equivalent to observā(re) to observe + -bilis -ble

observability, observableness, noun
observably, adverb
nonobservable, adjective
nonobservably, adverb
unobservable, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
observe (əbˈzɜːv)
vb (when intr, usually foll by on or upon; when tr, may take a clause as object)
1.  (tr; may take a clause as object) to see; perceive; notice: we have observed that you steal
2.  (when tr, may take a clause as object) to watch (something) carefully; pay attention to (something)
3.  to make observations of (something), esp scientific ones
4.  to make a comment or remark: the speaker observed that times had changed
5.  (tr) to abide by, keep, or follow (a custom, tradition, law, holiday, etc)
[C14: via Old French from Latin observāre, from ob- to + servāre to watch]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from L. observabilis, from observare (see observe).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
observable   (əb-zûr'və-bəl)  Pronunciation Key 
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.
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Example sentences
Particles could carry momentum into the extra dimension, and that could
  actually be observable.
But they have not shown that those practices cause observable differences in
  graduation rates.
Practice the fine art of examining what is observable rather than fantasizing
  what is not observable.
Science is always accountable: to the observable data and to the scientific
  community at large.
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