An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

To change continually; to shift back and forth; vary irregularly; to rise and fall in or as if in waves.

From L. fluctuationem (nom. fluctuatio), from fluctuare "to undulate," from fluctus "wave," from p.p. of fluere "to flow."

Verbal form of oftâxiz, → fluctuation.