What does the term 'fan' mean in baseball?

Answer:
Fan is short for the word fanatic.

A fanatic is someone overly enthusiastic with much devotion for something. At a ballpark you will see the patrons screaming and yelling (enthusiastic) and strongly rooting for their team to win no matter how good or bad the team may be (devotion).
First answer by Dlmick. Last edit by Dlmick. Contributor trust: 4858 [recommend contributor recommended]. Question popularity: 1 [recommend question].