"fluctuates slightly" is a correct and usable phrase in written English.
It can be used in a sentence to describe small and periodic changes or variations. Example: The stock market fluctuates slightly throughout the day, making it difficult to predict the exact closing price.
The difference between 37-GHz Vpol values and that of 37-GHz Hpol fluctuates slightly.
All three, it thought, were unusually influential.The sun's power output fluctuates slightly over a cycle that lasts about 11 years.
But in practice, the actual federal funds rate fluctuates slightly around its target as the Fed carries out its open-market operations in the money markets.
There are about 700 eligible Tony voters (the number fluctuates slightly from year to year), including members of professional theatrical organizations and members of the news media.
The mean velocity of each pedestrian in the corridor displays a trend that decreases sharply at the beginning and then fluctuates slightly around the mean value.
The neutral line current on the grid side fluctuates slightly around zero.
ROG fluctuated slightly during initial 2 ns of simulations followed by higher fluctuations up to 7 ns [Figure 2].
(The numbers will fluctuate slightly as unresolved races settle).
Officials and scientists dispute whether the amounts in groundwater, usually 4 to 100 parts per billion, are enough to suppress hormone levels in people, which fluctuate slightly anyway.
"It is not unusual for live listening figures to fluctuate slightly and it is natural we would see this reflected in individual programmes.
While money market funds keep a constant $1 net asset value, most ultrashort funds fluctuate slightly; that is the offset for the enhanced yield.
