chord ratio

space-chord ratio (of turbomachine cascade)

reduction ratio / gear ratio

Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio

jam to signal ratio (J/S ratio)

chord of the trajectory

reference chord

reference chord of an aerofoil

standard mean chord

chord

chord line

chord-wise aerodynamic force

external chord of a concavе-convex or flat-convex profile

first mean chord

flap reference chord

internal chord of а bi-convex profile

mean aerodynamic chord

mean geometric chord

pressure distribution curve along the chord of an aerofoil section

propeller blade chord

second mean chord

mean aerodynamic chord (MAC)

extended-chord elevon

aspect ratio

fighter-to-administrative personnel ratio

high expansion-ratio

mass ratio

power-to-weight ratio

signal-to-noise ratio (SNR; S/N)

thrust-to-weight ratio

damping ratio

attenuation ratio

base pressure ratio