effective

/ɪˈfɛktɪv/
adjective
  1. Producing the desired result; successful in achieving a goal.
    • This medicine is very effective at relieving headaches.
    • The new teaching method proved effective in helping students learn faster.
    • She is an effective leader who gets things done.
  2. In operation; actually in use or in force.
    • The new rules become effective on January 1st.
    • The law is effective only within the state's borders.
    • The contract is effective immediately upon signing.
  3. Making a strong impression; striking or impressive.
    • The black-and-white photography is especially effective in this scene.
    • The use of lighting was very effective in creating a dramatic mood.
    • Her simple but effective speech moved the audience to tears.
noun
  1. A soldier or unit ready for combat duty.
    • Only half of the battalion were effectives after the long march.
    • The general reported that the army had 20,000 effectives.
    • The commander counted the effectives before the battle.
What does "effective" mean? | whatsthatwordmean | whatsthatwordmean