A fearful state; a state of concern or hesitation.
I decided, with considerable trepidation, to let him drive my car without me.
An involuntary trembling, sometimes an effect of paralysis, but usually caused by terror or fear; quaking; quivering.
A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars.