(1):

(n.) Any touching of another's body willfully or in anger. This constitutes battery.

(2):

(n.) A single beat or throb of a series.

(3):

(n.) A stroke or impulse by which some medium is affected, as in the propagation of sounds.

(4):

(n.) A beating or throbbing, especially of the heart or of an artery, or in an inflamed part; a beat of the pulse.