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guide meridian

noun
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Definition of guide meridian

: a line that is marked by monuments, that runs north and south between other more carefully established meridians, and that is used for reference in surveying

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“Guide meridian.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/guide%20meridian. Accessed 8 December 2019.

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