what is the definition of an nba rookie
To qualify as a rookie in Major League Baseball, a player must not have exceeded 130 at bats or fifty innings pitched in the majors, and also fewer than 45 days on the active rosters of major league clubs (excluding time on the disabled list or any time after rosters are expanded on September 1) in their previous seasons. Major League Baseball awards the best rookie with the Major League Baseball Rookie of the Year Award, as voted upon by the Baseball Writers' Association of America.