1rare Repeatedly over a number of years; for years without change. Compare "year on year".

2Economics Finance
(chiefly North American). With reference to trends, gradual increases or decreases, etc.: with or in each passing or successive year.

3With reference to figures, financial data, etc.: as compared with the corresponding information from the previous year.

(chiefly North American). Relating to or shown by a comparison of corresponding figures from two consecutive years.