Bedeutung von “effective” — Learner’s Dictionary

effective

adjective us uk /ɪˈfektɪv/
Extra Examples
a highly effective treatmenta simple yet effective solution to the problemThe drug is effective at preventing heart attacks.Double glazing can be very effective in reducing noise levels.The drug is safer and more effective than earlier drugs.
ACHIEVING RESULT

B2 successful or achieving the result that you want:

effective management
What is the most effective way of teaching grammar?
become/be effective

If changes, laws, etc become effective, they officially start:

The new tax law becomes effective on Monday.
REAL [ always before noun ]

used to say what the real situation is although officially it is different:

She has effective control of the company.
→ Opposite ineffective
effectiveness noun [ U ]

(Definition von “effective” aus dem Cambridge Learner's Dictionary © Cambridge University Press)