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1 successful, and working in the way that was intended [≠ ineffective]: 
The cheaper drugs are just as effective in treating arthritis.Training is often much less effective than expected. the most effective ways of reducing inner city congestion
The cheaper drugs are just as effective in treating arthritis.Training is often much less effective than expected.the most effective ways of reducing inner city congestion2 [no comparative, not before noun]SCL if a law, agreement, or system becomes effective, it officially starts
3 [no comparative, only before noun] real rather than what is officially intended or generally believed : The rebels are in effective control of the city.
The rebels are in effective control of the city. —effectiveness noun [uncountable]
