Definitions of label:

• noun:   trade name of a company that produces musical recordings

  Example: "The artists and repertoire department of a recording label is responsible for finding new talent"

• noun:   a brief description given for purposes of identification

  Example: "The label Modern is applied to many different kinds of architecture"

• noun:   an identifying or descriptive marker that is attached to an object
• noun:   a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction
• verb:   distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
• verb:   distinguish (as a compound or molecule) by introducing a labeled atom
• verb:   assign a label to; designate with a label

  Example: "These students were labelled `learning disabled'"

• verb:   pronounce judgment on

  Example: "They labeled him unfit to work here"

• verb:   attach a tag or label to

  Example: "Label these bottles"