This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or relating to an operation or a series of operations.

adj. Of, intended for, or involved in military operations.

adj. Fit for proper functioning; ready for use: an operational aircraft.

adj. Being in effect or operation: "de facto apartheid still operational even in the 'new' African nations” ( Leslie Marmon Silko).

adj. of or relating to operations, especially military operations

adj. functioning and ready for use

adj. effective or operative

adj. of or pertaining to operations.

adj. Fit or ready for service; available and in working condition. Opposite of out-of-service.

adj. of or intended for or involved in military operations. Opposite of nonoperational.

adj. In force; not expired or annulled; -- of rules or laws.

adj. being in effect or operation

adj. pertaining to a process or series of actions for achieving a result

adj. (military) of or intended for or involved in military operations

adj. fit or ready for use or service

"In the defense as well as the offense, the term operational formation refers to the basic organization for combat by an army or army group."

operative    combat-ready    active    fighting    effective    serviceable   

functional    usable    useable    in order(predicate)    in working order(predicate)    operable   

Congregational    aberrational    coeducational    computational    conformational    confrontational    congregational    connotational    conversational    denominational   

tactical    organizational    technical    environmental    functional    critical    technological