heartbeat
//ˈhɑːrt.biːt//
Noun
heartbeatSingular
heartbeatsPlural
1
The pulsation of the heart, especially as felt or heard.
The doctor listened to my heartbeat with a stethoscope.
2
A very brief moment of time; an instant.
The news spread across the city in a heartbeat.
3
The central or vital part of something; the driving force.
This small town is the heartbeat of the local music scene.