(physics) A force field

(mathematics) a function mapping a subset of ℝⁿ into a subset of ℝⁿ / (differential geometry) a function which associates, to each point on a surface, a vector in the tangent plane of that point

(physics) A region of space (a vector field) in which a force operates; contains lines of force; a field of force. / (chemistry) A mathematical description of the potential energy of a system of atoms.

(optics) The angular extent of what can be seen, either with the eye or with an optical instrument or camera.

To test something using the conditions that it was designed to operate under, especially out in the real world instead of in a laboratory or workshop.

(idiomatic) A public place where strangers, paupers, and criminals are buried.

plural of potter's field

(idiomatic) Any area, non-dependent of locale, space, or contour, that contains the debris of wreckage, impact, sinking, or other material that once constituted a complete object. Debris fields can be found at the site of air crashes, water vessel sinking, explosions of buildings, collapses, and other events that render a whole entity into components, pieces, or other non-whole items.

(physics) The field of force that is due to the interaction of electric and magnetic forces of charged bodies

(sports) referring to track and field athletics.