heartbeat

nouns

the rhythmic contraction and expansion of the arteries with each beat of the heart
"he could feel the beat of her heart"
beat, heartbeat, pulsation, pulse
a very short time (as the time it takes the eye to blink or the heart to beat)
"if I had the chance I'd do it in a flash"
New York minute, blink of an eye, flash, heartbeat, instant, jiffy, split second, trice, twinkling, wink
an animating or vital unifying force
"New York is the commercial heartbeat of America"
heartbeat
is a type of (narrower)
a powerful effect or influence
"the force of his eloquence easily persuaded them"
force