selector

from WordNet (r) 3.0 (2006)

selector
    n 1: a person who chooses or selects out [syn: {picker},
         {chooser}, {selector}]
    2: a switch that is used to select among alternatives [syn:
       {selector}, {selector switch}]

from The Collaborative International Dictionary of English v.0.48

Selector \Se*lect"or\, n. [L.]
   One who selects.
   [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

selector

   <programming> 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".

   (1998-01-12)