usable

[yoo-zuh-buhl]
adjective
1.
available or convenient for use: 2000 square feet of usable office space.
2.
capable of being used: That saw is no longer usable.
Also, useable.


Origin:
1350–1400; Middle English < Middle French; see use, -able

usability, usableness, noun
usably, adverb
nonreusable, adjective, noun
nonusable, adjective
reusability, noun
reusable, adjective
reusableness, noun
unusable, adjective
unusableness, noun
unusably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
usable or useable (ˈjuːzəbəl)
 
adj
able to be used
 
useable or useable
 
adj
 
usa'bility or useable
 
n
 
usea'bility or useable
 
n
 
'usableness or useable
 
n
 
'useableness or useable
 
n
 
'usably or useable
 
adv
 
'useably or useable
 
adv

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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Etymonline
Word Origin & History

usable
1382, from O.Fr. usable (1311), from user (see use). Not a common word before c.1840.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

usability definition

programming
The effectiveness, efficiency, and satisfaction with which users can achieve tasks in a particular environment of a product. High usability means a system is: easy to learn and remember; efficient, visually pleasing and fun to use; and quick to recover from errors.
(http://orrnet.com/).
(1999-04-01)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Meier said his approach to measure usability could catch on and be used for
  many other products.
Instead the actual usability of the product is not discussed in the article at
  all.
Careful indexing made a real difference to a computer's usability.
Tech firms also hire people with psychology backgrounds as usability
  researchers.
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