An example of fluctuate is when a temperature goes from hot to cold to hot.
School enrollment has fluctuated from year to year.
Prices fluctuated wildly.
Origin of fluctuate
- Latin flūctuāre flūctuāt- from flūctus a flowing from past participle of fluere to flow bhleu- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition