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brightline

[brahyt-lahyn] /ˈbraɪtˌlaɪn/
adjective
1.
(of rules, standards, etc.) unambiguously clear:
This muddies the waters of what should be a brightline rule.
noun
2.
Physical Chemistry, brightline spectrum.
Also, bright-line.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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