[ef.fec.tive] adj (14c) 1 a: producing a decided, decisive, or desired effect b: impressive, striking "a gold lame fabric studded with ~ ... precious stones --Stanley Marcus"
2: ready for service or action "~ manpower"
3: actual "the need to increase ~ demand for goods"
4: being in effect: operative "the tax becomes ~ next year"
5. of a rate of interest: equal to the rate of simple interest that yields the same amount when the interest is paid once at the end of the interest period as a quoted rate of interest does when calculated at compound interest over the same period--compare nominal
4. -- ef.fec.tive.ness n -- ef.fec.tiv.i.ty n syn effective, effectual, efficient, efficacious mean producing or capable of producing a result. effective stresses the actual production of or the power to produce an effect "an effective rebuttal". effectual suggests the accomplishment of a desired result esp. as viewed after the fact "the measures to stop the pilfering proved effectual". efficient suggests an acting or a potential for action or use in such a way as to avoid loss or waste of energy in effecting, producing, or functioning "an efficient small car". efficacious suggests possession of a special quality or virtue that gives effective power "a detergent that is efficacious in removing grease".
effective n (1722): one that is effective; esp: a soldier equipped for duty