“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.
Agricultural and Biological Sciences32Chemistry31Materials Science23Engineering15Chemical Engineering10Medicine: Medicine (General): Medical physics. Medical radiology. Nuclear medicine1Science: Chemistry1Technology: Chemical technology: Polymers and polymer manufacture1