[lahyt-fast, -fahst]
not affected or faded by light, especially sunlight; colorfast when exposed to light.

1955–60; light1 + fast1

lightfastness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Besides the necessity in the sun-filled loggia to display lightfast objects, there is a method to the presentation.
However, these materials as a group should not be considered completely lightfast and caution should be used when displaying them.
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