Webster's English Dictionary

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operational

op.er.a.tion.al \-shn*l, -sh*n-*l\ aj 1: of, relating to, or based on 
   operations {~ definition}  2a: of, engaged in, or connected with execution 
   of military or naval opera tions in campaign or battle 2b: ready for or in 
   condition to undertake a destined function