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.
Off the field, Rogers Hornsby was tough, uncompromising and outspoken. On it, he was the greatest right-handed batter in baseball history. Hornsby, whose season-record .424 average and .358 lifetime mark for 23 big league campaigns established him as the standard for right-handed batters, was elected to the Hall of Fame 70 years ago this week.