plural of field train

(rugby, American football) A field in which there are defensive players from the other team between the player who has the ball and the goal. / A field that has been plowed.

(algebra, Galois theory) A subfield of a given field which contains all of the fixed points that are common to all of the automorphisms of some subgroup of the automorphism group of that given field.

(rare) A tent. / (Canada, US) A large building for indoor sports, particularly at colleges. / (Canada, US) A building for equipment storage and changing rooms (locker rooms) by an outdoor sports field.

plural of field mouse

(cricket, in a one-day match) A line, marked on the field, consisting of two semicircles around each wicket joined by parallel lines, outside of which there may be no more than two fielders

plural of field effect

(acoustics) The region within a distance a fraction of a wavelength from a sound source. Accordingly, the outer boundary of the near-field region is closer for high-pitched sound than for low-pitched sound.

(construction) A splice or seam made in the field (not factory) where overlapping sheets are joined together using an adhesive, splicing tape, or heat or solvent welding.

(algebra) A field which has an order relation satisfying these properties: trichotomy, transitivity, preservation of an inequality when the same element is added to both sides, and preservation of an inequality when the same strictly positive element is multiplied to both sides.