op·er·a·tion·al

[op-uh-rey-shuh-nl]
adjective
1.
able to function or be used; functional: How soon will the new factory be operational?
2.
Military.
a.
of, pertaining to, or involved in military operations.
b.
on active service or combat duty: All units of the command are operational.
3.
of or pertaining to operations or an operation.

Origin:
1920–25; operation + -al1

op·er·a·tion·al·ly, adverb
non·op·er·a·tion·al, adjective
pre·op·er·a·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
operational (ˌɒpəˈreɪʃənəl) [Click for IPA pronunciation guide]
 
adj
1.  of or relating to an operation or operations
2.  in working order and ready for use
3.  military capable of, needed in, or actually involved in operations
 
oper'ationally
 
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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00:10
Operational is always a great word to know.
So is doohickey. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

operational
1922, from operation. Related: Operationalization; operationalize.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Requiring a match, preferably out of operational funds, may help.
Most operational spacecraft use protective shielding to mitigate the impact of
  objects less than one centimeter in diameter.
Commissioning is the last milestone before the mission becomes operational and
  starts delivering usable data.
Operational plans should flow logically from the strategic plan.
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