noun
a rapid, irregular, and unsynchronized contraction of muscle fibers, particularly of the heart muscles
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Atrial fibrillation is a common type of irregular heartbeat.
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My grandpa has atrial fibrillation, but he manages it well with medication.
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I heard that stress can trigger fibrillation in some people.
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The political atmosphere was so tense, it felt like the country was in a state of fibrillation.