"efficiency" - key terms from Wikipedia

aerodynamic efficiency
allocative efficiency
battle efficiency
carnot efficiency
combustion efficiency
compression efficiency
conversion efficiency
core thermal efficiency
cycle efficiency
economic efficiency
efficiency
efficiency	due
efficiency	map
efficiency	wages
energy conversion efficiency
energy efficiency
energy efficiency	ratio
exergy efficiency
fuel efficiency
fuel efficiency	than
gas efficiency
high efficiency
higher efficiency
link spectral efficiency
luminous efficiency
market efficiency
maximum efficiency
mental efficiency
modulation efficiency
overall efficiency
pareto efficiency
passing efficiency
photosynthetic efficiency
power efficiency
productive efficiency
propulsive efficiency
pump efficiency
quantum efficiency
reflection efficiency
rotor efficiency
seasonal energy efficiency	ratio
spectral efficiency
system spectral efficiency
tax efficiency
thermal efficiency
thermodynamic efficiency
turbine efficiency
use efficiency
volumetric efficiency
water efficiency