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Umkehrpunkt m
IT, scient.	cusp
math.	turning point
meas.inst.	turn-round point
met.	Ar-point; arrest point
opt.	point of inversion
phys.	dead center; point of return; stagnation point
tech.	inversion point; reversal point; overturning moment; reversal of point

Umkehrpunkt: 4 phrases in 3 subjects

Optics branch of physics	1
Physics	1
Technology	2