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reduction ratio / gear ratio
Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio
jam to signal ratio (J/S ratio)
compression ignition engine
compression tank
compression sack, stuff sack
compression of grease in the barrel
compression chuckle
compression end
compression relief cock
compression slope
compression wave front
idler compression spring
compression ignition
compression piston ring
compression process
compression zone
supersonic external-compression inlet duct
supersonic internal-compression inlet duct
compression deformation
compression test
compression strain
Mach compression line
simple compression wave
compression
compression failure
compression stroke
azimuth compression
fractal compression
fractal image compression
speech compression technique
intra-pulse modulation (pulse compression / modulation on pulse, MOP)