selector

selector [si′lek·tər]

(civil engineering)

A device that automatically connects the appropriate railroad signal to control the track selected.

(computer science)

Computer device which interrogates a condition and initiates a particular operation dependent upon the report.

(electricity)

An automatic or other device for making connections to any one of a number of circuits, such as a selector relay or selector switch.

(engineering)

A device for selecting objects or materials according to predetermined properties.

A device for starting or stopping at predetermined positions.

(mechanical engineering)

The part of the gearshift in an automotive transmission that selects the required gearshift bar.

The lever with which a driver operates an automatic gearshift.

(metallurgy)

A converter that separates purified copper from residue in a single operation.

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(programming)

selector - 1. In Smalltalk or Objective C, the syntax of a message which selects a particular method in the target object. 2. An operation that returns the state of an object but does not alter that state. Selector functions or methods often have names which begin with "get" and corresponding modifier methods or procedures whose names begin with "set".