“2-yr mean citedness” is the OpenAlex field summary_stats.2yr_mean_citedness (CC0): mean citations per paper over a two-year window. It is a raw bibliometric field, not a journal rating, and is not used for default ranking.
Arts and Humanities9Business, Management and Accounting9Chemistry9Engineering9Agricultural and Biological Sciences8Chemical Engineering8Computer Science8Technology: Engineering (General). Civil engineering (General)1