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You need more effective communication within the organization.
Humour is often far more effective than shouting.
The troops should be deployed where they will be most effective.
The new vaccine is highly effective against all strains of the disease.
This is a very effective way of controlling pests and weeds.
The US military is in effective control of the entire region.
This is the British English definition of effective. View American English definition of effective.
an old word for a young woman who is not married