fluctuator

plural fluctuators

1. One who or that which fluctuates.

   Thus, although this department was among the more volatile fluctuators between regular and cutback budgets, the overall effect on the department suggests that growth was nearly static.

   1988, Susanne Rockne Morris, Budget Cutback: An Empirical Test of Budgeting Theory in Conditions of Fiscal Stress, page 130

2. natural sciencesA quantum system in which an electric charge moves back and forward between two states that are separated by an energy barrier