defining vs labeling

defining

adj
  • Serving to define or distinguish. 

labeling

noun
  • The introduction of a traceable chemical group (e.g., containing an isotope or a fluorescent dye) into a protein or other biomolecule of interest so it can be tracked or quantified during experimental analysis. 

  • A set of labels applied to the various objects in a system. 

How often have the words defining and labeling occurred in a corpus of books? (source: Google Ngram Viewer )