Fluctuation /(?)/

Fluc·tu·a·tion

Fluctuation

n.
  1. A motion like that of waves; a moving in this and that direction; as, the fluctuations of the sea.
  2. A wavering; unsteadiness; as, fluctuations of opinion; fluctuations of prices.
  3. The motion or undulation of a fluid collected in a natural or artifical cavity, which is felt when it is subjected to pressure or percussion. (Med.)