A distribution in a region of space of the strength and direction of a force, such as the electrostatic force near an electrically charged object, that would act on a body at any given point in that region. See also electric field, magnetic field.
The region whose image is visible to the eye or accessible to an optical instrument.
A set of elements having two operations, designated addition and multiplication, satisfying the conditions that multiplication is distributive over addition, that the set is a group under addition, and that the elements with the exception of the additive identity (0) form a group under multiplication. The set of all rational numbers is a field.
In a database, a space for a single item of information contained in a record.
An interface element in a graphical user interface that accepts the input of text.