Defar denied her compatriot Tirunesh Dibaba the chance to add another title to the 10,000m crown she won a week ago, having taken gold in both events in Beijing.
Instead Defar, who won 5000m gold eight years ago in Athens, held off her challengers down the home straight to win in 15:04.25.
Kenya's Vivian Cheruiyot was second, with Dibaba getting the bronze.
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