Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
fluctuate [ˈflʌktjueɪt] vi (price, rate, temperature) колеба́ться*(impf) (opinions, attitudes) меня́ться (impf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: