What do the terms 'kittenball' 'ladies' baseball' and 'playground ball' mean?

Kitten ball is another name for softball. Softball was invented in 1887 and was designed to be an indoor sport. In 1895, a member of the Minneapolis, Minnesota fire department named Lewis Rober invented outdoor softball and named it Kitten League Ball, which was subsequently shortened to Kitten Ball. The name was changed from kitten ball to diamond ball in 1922 and eventually to softball in 1926.