ETYM Arch.
A slight irregular shaking motion; SYN. jiggle.

ETYM Latin pulsatio a beating or striking: cf. French pulsation.
(Electronics) A sharp transient wave in the normal electrical state (or a series of such transients); SYN. pulsing, pulse, impulse.

Unit of time equal to a hundred-millionth of a second, used in describing nuclear processes.
In music, an alternate name for trill, in which two adjacent notes rapidly alternate.
1. The act or result of shaking; a vacillating or wavering motion; a rapid motion one way and other; a trembling or quaking.
2. A fissure or crack in timber, caused by its being dried too suddenly.
3. A fissure in rock or earth.
4. A milkshake.

A rocking motion.