Definition of year-over-year
: comparing or based on comparing the same time period in successive years
year-over-year growth year-over-year increases/declines The insurer said it paid out 16 percent less for catastrophe and storm claims on a year-over-year basis in the fourth quarter …— Victor Epstein, The Des Moines Register, 21 Feb. 2014
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Time Traveler for year-over-year
The first known use of year-over-year was in 1951
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