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[op-uh-rey-shuh-nl] /ˌɒp əˈreɪ ʃə nl/

able to function or be used; functional:
How soon will the new factory be operational?

of or relating to operations or an operation.
of or relating to an operation or operations
in working order and ready for use
(military) capable of, needed in, or actually involved in operations

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


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    noun, Mathematics. 1. a method for solving a differential equation by treating differential operators as ordinary algebraic quantities, thus obtaining a simpler problem.

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