A quarter is another way of saying one fourth, in this setting, one fourth of a year = three months. Quarterly means something that happens every 3 months. Edit
Outfielder Ty Cobb, whose career ended in 1928, has the highest batting average in Major League Baseball (MLB) history. He batted .366 over 24 seasons, mostly with the Detroit Tigers. In addition, he won a record 11 batting titles for leading the American League in BA over the course of an entire season.
Batting titles have become commonplace for Cabrera, who won three straight from 2011-2013 before hitting .313 last season for his lowest average since 2008. The Detroit slugger is putting the competition to shame this season with a .351 mark, 33 points ahead of his closest pursuer â Clevelandâs Michael Brantley.