An algebraic structure, the most familiar instance of which is the real numbers. A field is a set F with two binary operations (functions from pairs in F into F), marked + and ., which we call addition and multiplication -- in the case of reals, these are the familiar operations. The . is often dropped. The following properties hold:

1. There exist (different) elements 0 and 1, such that for all a in F a.1 = a+0 = a
2. Associativity: for all a,b,c in F a+(b+c) = (a+b)+c and a(bc)=(ab)c
3. Commutativity: for all a,b a+b = b+a and ab = ba
4. Distributivity: for all a,b,c in F a(b+c) = (ab) + (ac)
5. Inverse elements: for every a in F there exists an element marked -a such that -a+a=0; if a is not zero, there is also an element marked a-1 such that aa-1=1

The complex numbers are another important and well-known field. So are finite fields.

Galois Theory connects fields and their subfields (or extension fields) with their automorphism groups and their subgroups. It is the source of much of what we can say about fields...

In interlaced video displays, (TV), half a frame, consisting of every other horizontal line or row of the image. Fields are displayed sequentially, and as such exhibit a one line vertical offset, and a temporal difference, (when displaying moving images). In a television signal, the two fields referred to as odd and even. In the US and Japan a field contains 262½ lines. In the rest of the world a field contains 312½ lines.

An algebraic entity consisting of a set of elements and two binary associative operations on those elements, usually called addition and multiplication. If the multiplication operation is not commutative, we call it a skew field or division ring. If there are non-zero elements which don't have multiplicative inverses, we have a ring.

In Combinatorics the fields of greatest interest are finite. A finite field must have size equal to a power of a prime, and are usually denoted GF(p) (for Galois Field). The finite field with two elements, GF(2), is of particular importance. GF(2) consists of the two elements 0 and 1, connected by the operations + and * as in the following tables:

+   |   0   1
---+--------
0   |   0   1
|
1   |   1   0

*   |   0   1
---+--------
0   |   0   0
|
1   |   0   1

--back to combinatorics--

A representation of data of a defined type, as part of a record in a database.

Records, being a collection of one or more properties stored in fields, are used to represent items of such a nature that they have properties similar in structure but generally different in contents. Each record can be written as a new line in a table with a column for each field of the records.

In some object oriented programming languages, like Java, the private varibles specific to a class that define the properties of the class are called fields. For example, a Person class might have the class fields name and age, by convention accessed through getName() and getAge() and mutated through setName() and setAge(). (C++ programmers like to refer to fields as data members.)

Field (?), n. [OE. feld, fild, AS. feld; akin to D. veld, G. feld, Sw. falt, Dan. felt, Icel. fold field of grass, AS. folde earth, land, ground, OS. folda.]

1.

Cleared land; land suitable for tillage or pasture; cultivated ground; the open country.

2.

A piece of land of considerable size; esp., a piece inclosed for tillage or pasture.

Fields which promise corn and wine. Byron.

3.

A place where a battle is fought; also, the battle itself.

In this glorious and well-foughten field. Shak.

What though the field be lost? Milton.

4.

An open space; an extent; an expanse.

Esp.: (a)

Any blank space or ground on which figures are drawn or projected.

(b)

The space covered by an optical instrument at one view.

Without covering, save yon field of stars. Shak.

Ask of yonder argent fields above. Pope.

5. Her.

The whole surface of an escutcheon; also, so much of it is shown unconcealed by the different bearings upon it. See Illust. of Fess, where the field is represented as gules (red), while the fess is argent (silver).

6.

An unresticted or favorable opportunity for action, operation, or achievement; province; room.

Afforded a clear field for moral experiments. Macaulay.

7.

A collective term for all the competitors in any outdoor contest or trial, or for all except the favorites in the betting.

8. Baseball

That part of the grounds reserved for the players which is outside of the diamond; -- called also outfield.

Field is often used adjectively in the sense of belonging to, or used in, the fields; especially with reference to the operations and equipments of an army during a campaign away from permanent camps and fortifications. In most cases such use of the word is sufficiently clear; as, field battery; field fortification; field gun; field hospital, etc. A field geologist, naturalist, etc., is one who makes investigations or collections out of doors. A survey uses a field book for recording field notes, i.e., measurment, observations, etc., made in field work (outdoor operations). A farmer or planter employs field hands, and may use a field roller or a field derrick. Field sports are hunting, fishing, athletic games, etc.

Coal field Geol. See under Coal. -- Field artillery, light ordnance mounted on wheels, for the use of a marching army. -- Field basil Bot., a plant of the Mint family (Calamintha Acinos); -- called also basil thyme. -- Field colors Mil., small flags for marking out the positions for squadrons and battalions; camp colors. -- Field cricket Zool., a large European cricket (Gryllus campestric), remarkable for its loud notes. -- Field day. (a) A day in the fields. (b) Mil. A day when troops are taken into the field for instruction in evolutions. Farrow. (c) A day of unusual exertion or display; a gala day. -- Field driver, in New England, an officer charged with the driving of stray cattle to the pound. -- Field duck Zool., the little bustard (Otis tetrax), found in Southern Europe. -- Field glass. Optics (a) A binocular telescope of compact form; a lorgnette; a race glass. (b) A small achromatic telescope, from 20 to 24 inches long, and having 3 to 6 draws. (c) See Field lens. -- Field lark. Zool. (a) The skylark. (b) The tree pipit. -- Field lens Optics, that one of the two lenses forming the eyepiece of an astronomical telescope or compound microscope which is nearer the object glass; -- called also field glass. -- Field madder Bot., a plant (Sherardia arvensis) used in dyeing. -- Field marshal Mil., the highest military rank conferred in the British and other European armies. -- Field mouse Zool., a mouse inhabiting fields, as the campagnol and the deer mouse. See Campagnol, and Deer mouse. -- Field officer Mil., an officer above the rank of captain and below that of general. -- Field officer's court U.S.Army, a court-martial consisting of one field officer empowered to try all cases, in time of war, subject to jurisdiction of garrison and regimental courts. Farrow. -- Field plover Zool., the black-bellied plover (Charadrius squatarola); also sometimes applied to the Bartramian sandpiper (Bartramia longicauda). -- Field spaniel Zool., a small spaniel used in hunting small game. -- Field sparrow. Zool. (a) A small American sparrow (Spizella pusilla). (b) The hedge sparrow. [Eng.] -- Field staff> Mil., a staff formerly used by gunners to hold a lighted match for discharging a gun. -- Field vole Zool., the European meadow mouse. -- Field of ice, a large body of floating ice; a pack. -- Field, ∨ Field of view, in a telescope or microscope, the entire space within which objects are seen. -- Field magnet. see under Magnet. -- Magnetic field. See Magnetic. -- To back the field, ∨ To bet on the field. See under Back, v. t. -- To keep the field. (a) Mil. To continue a campaign. (b) To maintain one's ground against all comers. -- To lay, ∨ back, against the field, to bet on (a horse, etc.) against all comers. -- To take the field Mil., to enter upon a campaign.

Field (?), v. i. [imp. & p. p. Fielded; p. pr. & vb. n. Fielding.]

1.

To take the field.

[Obs.]

Spenser.

2. Ball Playing

To stand out in the field, ready to catch, stop, or throw the ball.

Field, v. t. Ball Playing

To catch, stop, throw, etc. (the ball), as a fielder.

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