Etymology
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fibrillation (n.)

1842, "state of being fibrillar" (that is, "arranged in fibrils"), noun of action from fibrillate (v.). Especially "a quavering in the fibrils of the muscles of the heart" causing irregular beating (1882).

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Definitions of fibrillation

fibrillation (n.)
muscular twitching involving individual muscle fibers acting without coordination;
fibrillation (n.)
act or process of forming fibrils;
From wordnet.princeton.edu