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twilight band

noun
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Definition of twilight band

: a narrow zone in which a pilot flying at the edge of the on-course radio beam can detect both the on-course and off-course signals

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“Twilight band.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/twilight%20band. Accessed 6 December 2019.

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