fluctuations

plural of fluctuation

(countable, uncountable) A motion like that of waves; a moving in this and that direction; an irregular rising and falling.
(countable, uncountable) A wavering; unsteadiness.
(countable, uncountable) In 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.