D defs.my
Entry 3 senses Webster, 1913

Fluctuation

/flŭkˌ-cho͞o-āsh'-ən/ · Fluc·tu·a·tion · IPA /flʌkt͡ʃuːˈeɪʃən/
01 n. A motion like that of waves; a moving in this and that direction; as, the fluctuations of the sea.
  1. 1.
    A motion like that of waves; a moving in this and that direction; as, the fluctuations of the sea.
  2. 2.
    A wavering; unsteadiness; as, fluctuations of opinion; fluctuations of prices.
  3. 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.)