Compression ratio
The ratio of the volume of a cylinder with the piston at the bottom of its stroke to the volume of the cylinder with the piston at the top of its stroke.
Also defined in 2 more sources
The ratio of the volume of a cylinder of a reciprocating engine with the piston at the bottom of its stroke engine to the volume of the cylinder with the piston at the top of its stroke.
Aviation Maintenance Technician Handbook — Powerplant, p. G-7
The ratio of the pressure of the air at the discharge of a turbine engine compressor to the pressure of the air at its inlet.
Aviation Maintenance Technician Handbook — Powerplant, p. G-7
Taught in GEN-H Concepts, GEN-H Procedures.