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brightline

or bright-line

[brahyt-lahyn]
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adjective
  1. (of rules, standards, etc.) unambiguously clear: This muddies the waters of what should be a brightline rule.
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noun
  1. Physical Chemistry. brightline spectrum.
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Origin of brightline

bright + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018