from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A single complete pulsation of the heart.
- n. A vital force or driving impulse: Broadway is the heartbeat of the New York City theater world.
- n. An instant: The police arrived at the scene in a heartbeat.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One pulsation of the heart; especially an irregular one, hence the emotion which causes it.
- n. The rhythm at which a heart pulsates, a cardiac indicator
- n. A driving impulse or vital force.
- n. A very short space of time; an instant.
- n. A periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a system.
from the GNU version of the Collaborative International Dictionary of English
- n. the audible and palpable rhythmic contraction and expansion of the arteries with each beat of the heart.
from The Century Dictionary and Cyclopedia
- n. A pulsation of the heart, including one complete systole and diastole, corresponding to that motion in the arteries called the pulse.
- n. Hence Figuratively, a thought; an emotion, especially one that is tender or sad; a pang; a throb or throe of feeling.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an animating or vital unifying force
- n. a very short time (as the time it takes the eye to blink or the heart to beat)
- n. the rhythmic contraction and expansion of the arteries with each beat of the heart
From heart + beat (Wiktionary)