operative C2+

/ˈɑpərətɪv/ functioning or having effect; in operation

operable C2+

/ˈɑpərəbəl/ able to be used or operated; suitable for surgery

operand C2+

/ˈɑpəˌrænd/ a quantity or value on which an operation is performed

operant C2+

/ˈɑpərənt/ producing effects; relating to behavior modified by its consequences