[n] trade name of a company that produces musical recordings; "the artists and repertoire department of a recording label is responsible for finding new talent"
[n] a brief description given for purposes of identification; "the label Modern is applied to many different kinds of architecture"
[n] an identifying or descriptive marker that is attached to an object
[n] a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction
[v] distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
[v] distinguish (as a compound or molecule) by introducing a labeled atom
[v] pronounce judgment on; "They labeled him unfit to work here"
[v] assign a label to; designate with a label
[v] attach a tag or label to; "label these bottles"