1 adj Something that is effective works well and produces the results that were intended.
oft ADJ in -ing, ADJ against n
The project looks at how we could be more effective in encouraging students to enter teacher training..., Simple antibiotics are effective against this organism..., ...an effective public transport system.
effectively adv usu ADV after v, also ADV -ed
...the team roles which you believe to be necessary for the team to function effectively..., Services need to be more effectively organised than they are at present.
effectiveness n-uncount oft N of n
...the effectiveness of computers as an educational tool.
2 adj Effective means having a particular role or result in practice, though not officially or in theory.
They have had effective control of the area since the security forces left.
3 adj When something such as a law or an agreement becomes effective, it begins officially to apply or be valid. v-link ADJ The new rules will become effective in the next few days.
Something that is cost-effective saves or makes a lot of money in comparison with the costs involved. adj
The bank must be run in a cost-effective way.
cost-effectively adv ADV after v
The management tries to produce the magazine as cost-effectively as possible.
A Home Office report has raised doubts about the cost-effectiveness of the proposals.
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