- Compared to the corresponding data from one year previously. For example, if a firm's 2nd-quarter profit rose 12% y/y, then its 2nd-quarter profit this year was 12% higher than its 2nd quarter profit the year before. Same as year-over-year.
- acronymY/Y (written as Year-on-year)
- acronymYOY (written as Year-on-year)