alpha male noun 2adjective 1forms 3 noun2 •The dominant male in a group of animals. •A dominant, assertive, protective, oftentimes successful, leadership-type man or male.Alpha male investing Aggressive stock-picker on the prowl for less risky financial plan Stanley Richards may have been a latecomer to investing, but he's made up for lost time by aggressively buying — 2000 adjective1 •Exhibiting the characteristics of a dominant male; dominant, assertive, and protective.You don't get more alpha male than this, I thought. — 2012 formsalpha males · more alpha male · most alpha male