1.NounA motion like that of waves; a moving in this and that direction; an irregular rising and falling.
"the fluctuations of the sea"
2.NounA wavering; unsteadiness.
"fluctuations of opinion; fluctuations of prices"
3.NounIn medicine, a wave-like motion or undulation of a fluid in a natural or abnormal cavity (e.g. pus in an abscess), which is felt during palpation or percussion.