What does body size mean?

body size meaning in Law Dictionary

The standard measurements of the font in the human body. The top of the tallest page as well as the bottom regarding the least expensive letter can be used when it comes to dimension. Its expressed in things.

body size meaning in Business Dictionary

Standard size of the body of a type font, measured from the top of the tallest ascender (the top-end of the letter 'd,' for example) to the bottom of lowest descender (the tail-end of letter 'p,' for example) and expressed in points.