heartbeat

/ˈhɑːtˌbiːt//ˈhɑɹtˌbit/

noun

1
One pulsation of the heart; especially an irregular one, hence the emotion which causes it.
“He alone gives me such heartbeats”
2
The rhythm at which a heart pulsates, a cardiac indicator
“If your heartbeat doesn't normalize soon, consult a doctor!”
3
A driving impulse or vital force.
“Music is the heartbeat of the people.”
4
A very short space of time; an instant.
“The ambulance arrived in a heartbeat.”
5
A periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a system.

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