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"Wavelength at maximum absorbance" is important in spectroscopy because it provides information about the electronic structure and molecular properties of the sample being analyzed. When a molecule absorbs light at a specific wavelength, it undergoes an electronic transition from the ground state to an excited state. The wavelength of maximum absorbance corresponds to the energy difference between these two states and can provide insights into the types of bonds and functional groups present in the molecule. It can also help identify and characterize specific compounds by comparing their absorption spectra to known reference spectra.