In baseball, it's the area enclosed by the 3 bases & home plate
[DOC] [TLE] Infield | Definition of Infield by Merriam-Webster [PAR] the part of a cricket field that is close to the wickets ... 2 a : the area of a baseball 
field enclosed by the three bases and home plate b : the defensive positions... [DOC] [TLE] What is a baseball diamond?