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optical
1: of or relating to the science of optics2 a: of or relating to vision : visual b: visible 1 <optical wavelength> c: of, relating to, or being objects that emit light in the visible range of frequencies <an optical galaxy> d: using the properties of light to aid vision <an optical instrument>3 a: of, relating to, or utilizing light especially instead of other forms of energy <optical microscopy> b: involving the use of light-sensitive devices to acquire information for a computer <optical character recognition>4: of or relating to optical art
— op·ti·cal·ly
\-k(ə-)lē\
adverb
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