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The detection, absorption, and use of light, as for vision in animals or phototropism and photosynthesis in plants.
(Biology) biology the absorption of light and its use for biological purposes such as vision in animals and photosynthesis in plants
pho•to•re•cep•tion(ˌfoʊ toʊ rɪˈsɛp ʃən)
the physiological perception of light.