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palpitation (n.)

early 15c., palpitacioun, "rapid movement, trembling or quivering motion," from Latin palpitationem (nominative palpitatio), noun of action from past-participle stem of palpitare "to throb, to flutter, to tremble, to quiver," frequentative of palpare "touch gently, stroke; wheedle, coax" (see palpable). Specifically of unnatural rapid beating or pulsation of the heart (excited by emotion, disease, etc.) by c. 1600.

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Definitions of palpitation

palpitation (n.)
a rapid and irregular heart beat;
palpitation (n.)
a shaky motion;
Synonyms: shaking / shakiness / trembling / quiver / quivering / vibration
From wordnet.princeton.edu