A1

A1, A-1 or A.1.may refer to:

Education

Grades

Western League (defunct minor league)

The Western League is a name given to several circuits in American minor league baseball. Its earliest progenitor, which existed from 1885 to 1899, was the predecessor of the American League. During the 20th century, there were four incarnations of the Western League, including a Class D loop that played from 1939–41 and an independent loop (outside of "organized baseball") that began play in 1995. This article, however, concentrates on the two Class A leagues that played from 1900–37 and from 1947–58.

The minor leagues went unclassified through 1901. From 1902 until 1911, Class A was the highest level in the minor leagues. In 1912, a new top tier, Class AA, was created; in 1936, a second tier, Class A1, came into being. In 1946, the Class AA leagues were renamed AAA, and the A1 loops were renamed AA. Thus the Western League – whose clubs were actually located in the Great Plains, Rocky Mountain States, the Upper Midwest and the Upper Southwest – was a top-level minor league until 1911, then two levels below Major League Baseball through 1935, and three steps removed in 1936–37 and when it was revived in 1947 during the post-war minor league baseball boom.