Definitions for y level
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Wiktionary
Y level(Noun)
A surveyor's instrument for measuring differences of level by means of a telescope resting in a Y-shaped support.
Webster Dictionary
Y level
see under Y, n
Citation
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"y level." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/y level>.

