Definition from macmillandictionary.com
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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 decorations are easy to make, yet very effective.
Government ministers reached a 30-month agreement, effective from 1 July.
The US military is in effective control of the entire region.
the effective agents in the spread of the disease