1. The regular expansion and contraction of an artery, caused by the heart pumping blood through the body: "The pulse can be felt through an artery that is near the surface; such as, the one in the wrist on the same side as the thumb.

2. A single expansion and contraction of an artery, caused by a beat of the heart.
3. A brief temporary change in a normally constant quantity; such as, in a voltage, or a series of intermittent disturbances that are regular in form and frequency of occurrence.
4. An abrupt change in a quantity, characterized by a rise and a decline, typically occurring over a short time interval; that is, a sharp variation of a current or volgage having a normally constant value.

1. To be full of energy and excitement: "He was pulsing with creative energy after receiving the award."
2. To move with regular beats: "Lorna could feel the blood pulsing through her veins when she heard what happened to her friend."
3. To be filled with activity or feelings: "The students at the school were pulsing with excitement when the final basketball score made them the winners of the tournament."

A decreased heart rate caused by the slowing action of stimuli from the vagus nerve: Jane, the nurse, checked Larry's pulse and was able to identify the vagus pulse which was causing the slow rhythmic dilation of the artery in his wrist.