You can find data definitions using the search functionality in the upper right of the Screener.co site. For example, the "Return on average assets-5 year average" definition is:
screener.co/component/content/article/55...314-text-and-article
"This value is calculated by first determining the annual Return on Assets for each of the 5 most recent fiscal years and then averaging the resulting values. The Return on Assets is the annual Income After Taxes divided by the Average Total Assets, expressed as a percentage."
