Meaning of EFFECTIVE in English

I. i-ˈfek-tiv, e-, ē-, ə- adjective

Date: 14th century


a. : producing a decided, decisive, or desired effect

an effective policy

b. : impressive , striking

a gold lamé fabric studded with effective …precious stones — Stanley Marcus

2. : ready for service or action

effective manpower

3. : actual

the need to increase effective demand for goods

4. : being in effect : operative

the tax becomes effective 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 noun

• ef·fec·tiv·i·ty ˌe-ˌfek-ˈti-və-tē, i-, ē-, ə- noun


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 especially 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

II. noun

Date: 1722

: one that is effective ; especially : a soldier equipped for duty

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.