Fluctuation

Part of speech: noun (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. Dunglison.