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operational (adj.)

1922, "pertaining to operation," from operation + -al (1). Meaning "in a state of functionality" is from 1944.

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Definitions of operational from WordNet

operational (adj.)
being in effect or operation; "de facto apartheid is still operational even in the `new' African nations"- Leslie Marmon Silko;
Synonyms: in operation / operating
operational (adj.)
pertaining to a process or series of actions for achieving a result;
operational difficulties
they assumed their operational positions
operational (adj.)
fit or ready for use or service;
an operational aircraft
Synonyms: functional / usable / useable / operable
operational (adj.)
(military) of or intended for or involved in military operations;
From wordnet.princeton.edu