[ brahyt-lahyn ]
/ ˈbraɪtˌlaɪn /
(of rules, standards, etc.) unambiguously clear: This muddies the waters of what should be a brightline rule.
Physical Chemistry. brightline spectrum.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for brightline
But monochromatic or "bright-line" light is, by its nature, incapable of being so diffused.
Possibly all such stars have passed through a bright-line stage; but further evidence on the point is needed.