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осевой меридиан stresses
cartogr.	initial meridian; principal meridian
construct.	central meridian
geol.	prime meridian
nautic.	standard meridian (картографической сетки)
navig.	meridian of origin; reference meridian; standard meridian; mid-meridian
tech.	mean meridian

осевой меридиан: 9 phrases in 3 subjects

Cartography	2
Navigation	4
Surveying	3