In this case it has a slightly different meaning: the fraction of radiation absorbed at a specific wavelengths.

Chromophores can absorb light at specific wavelengths and therefore cause colors.

Unlike most earlier papers, this study encompassed a 15-year period at one specific wavelength.

Their performance is wavelength specific; a fact that may be a limitation.

Some reactants are able to use specific wavelengths of light more effectively to complete their reactions.

Specialized filters are also used to record images in specific wavelengths.

Each individual substance absorbs specific different wavelengths of visible light.

It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete.

The radiation absorption enables the analysis with a specific wavelength for gases.

The drug is triggered by light of a specific wavelength.