Baseball

• major league

  The most important league in any sport (especially baseball).

• minor league

  A league of teams that do not belong to a major league (especially baseball).

Also contains

• baseball league

  A league of baseball teams.

• basketball league

  A league of basketball teams.

• football league

  A league of football teams.

• hockey league

  A league of hockey teams.

• bowling league

  A league of bowling teams.

• Ivy League

  A league of universities and colleges in the northeastern United States that have a reputation...

• division

  A league ranked by quality; "he played baseball in class D for two years"; "Princeton is...