Subject to irregular changes in quantity or quality.

A fluctuation.

present participle of fluctuate

plural of fluctuating

One who or that which fluctuates. / (physics) A quantum system in which an electric charge moves back and forward between two states that are separated by an energy barrier

plural of fluctuator

Of, pertaining to, or resulting from fluctuation(s)

Third-person singular simple present indicative form of fluctuate

A motion like that of waves; a moving in this and that direction. / A wavering; unsteadiness.

(intransitive) To vary irregularly; to swing. / (intransitive) To undulate. / (intransitive) To be irresolute; to waver. / (transitive) To cause to vary irregularly.