In a manner involving or relating to diffraction; by means of the bending and spreading of waves.
From 'diffractive' plus the adverb suffix '-ly.' The adverb form indicates that an action or process occurs through or by means of diffraction.
When scientists describe how a hologram works 'diffractively,' they mean the light is bent and encoded in such a way that it recreates a 3D image—the exact same principle makes security holograms on credit cards!
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