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From The Collaborative International Dictionary of English v.0.48:
operational \operational\ adj. 1. of or pertaining to operations; as, operational procedure. [WordNet 1.5] 2. Fit or ready for service; available and in working condition; as, an operational aircraft. Opposite of out-of-service. Syn: functional, usable, useable, in order(predicate), in working order(predicate), operable. [WordNet 1.5] 3. (Mil.) of or intended for or involved in military operations. Opposite of nonoperational. [WordNet 1.5] 4. In force; not expired or annulled; -- of rules or laws. [WordNet 1.5] de facto apartheid still operational even in the `new' African nations --Leslie Marmon Silko [WordNet 1.5]