“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.
Computer Science7Biochemistry, Genetics and Molecular Biology4Dentistry3Medicine3Medicine: Medicine (General): Medical physics. Medical radiology. Nuclear medicine1Medicine: Medicine (General): Medical technology1Science: Physics1Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics1