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heartbeat

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Heartbeat is defined as the pulse of your heart, or a single short moment, or something that acts as a unifying force.

(noun)

When your heart pulses and pumps blood throughout your body, this is an example of a heartbeat.
When you feel as if the entire summer passed you by in just a single second, this is an example of a time when you might say it went by in a heartbeat.
When the president of a club is the one that keeps the entire club together and functioning, this is an example of a time when the president is the heartbeat.

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See heartbeat in Webster's New World College Dictionary

noun

1. one pulsation, or full contraction and dilation, of the heart
2. the continuous series of such pulsations constituting the rhythmic beating of the heart: an irregular heartbeat
a very brief period of time; moment; instant: reappeared in a heartbeat
the vital core or motivating force

See heartbeat in American Heritage Dictionary 4

noun

A single complete pulsation of the heart.
A vital force or driving impulse: Broadway is the heartbeat of the New York City theater world.
An instant: The police arrived at the scene in a heartbeat.

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