Source : Webster's Revised Unabridged Dictionary (1913)

Spectroscopy \Spec*tros"co*py\, n.
   The production and investigation of spectra; the use of the
   spectroscope; also, the science of spectroscopic phenomena.

Spectroscopy \Spec*tros"co*py\, n.
   The use of the spectroscope; investigations made with the
   spectroscope.

Source : WordNet®

spectroscopy
     n : the use of spectroscopes to analyze spectra [syn: {spectrometry},
          {spectroscopic analysis}, {spectrum analysis}, {spectrographic
         analysis}]