“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.
Social Sciences13Arts and Humanities12Medicine11Biochemistry, Genetics and Molecular Biology10Pharmacology, Toxicology and Pharmaceutics9Agricultural and Biological Sciences8Medicine: Public aspects of medicine1Social Sciences: Social pathology. Social and public welfare. Criminology1