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stadia1

[stey-dee-uh] /ˈsteɪ di ə/
noun
1.
a method of surveying in which distances are read by noting the interval on a graduated rod intercepted by two parallel cross hairs (stadia hairs or stadia wires) mounted in the telescope of a surveying instrument, the rod being placed at one end of the distance to be measured and the surveying instrument at the other.
adjective
2.
pertaining to such a method of surveying.
Origin
1860-1865
1860-65; probably special use of stadia2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for stadia hairs

stadia1

/ˈsteɪdɪə/
noun
1.
  1. tacheometry that makes use of a telescopic surveying instrument and a graduated staff calibrated to correspond with the distance from the observer
  2. (as modifier): stadia surveying
2.
the two parallel cross hairs or stadia hairs in the eyepiece of the instrument used
3.
the staff used
Word Origin
C19: probably from stadia²

stadia2

/ˈsteɪdɪə/
noun
1.
a plural of stadium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for stadia

7
7
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