a region where a battle is being (or has been) fought

somewhere (away from a studio or office or library or laboratory) where practical work is done or data is collected

a particular kind of commercial enterprise

a particular environment or walk of life

(mathematics) a set of elements such that addition and multiplication are commutative and associative and multiplication is distributive over addition and there are two elements 0 and 1

a region in which active military operations are in progress

all of the horses in a particular horse race

all the competitors in a particular contest or sporting event

a place where planes take off and land

the area that is visible (as through an optical instrument)

(computer science) a set of one or more adjacent characters comprising a unit of information

a geographic region (land or sea) under which something valuable is found

catch or pick up (balls) in baseball or cricket

select (a team or individual player) for a game