Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   The 
angle , at any point on the surface of the Earth, betweengrid north andmagnetic north. 
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Contraction of grid (magnetic) variation.
			
		
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Examples
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tankhughes commented on the word grivation
Related: isogriv
March 14, 2023