"approximation" - key terms from Wikipedia

approximation
approximation	algorithm
approximation	points
approximation	theory
bakhshali approximation
best approximation
best linear approximation
binary approximation
dipole approximation
electron approximation
fitness approximation
function approximation
gw approximation
initial approximation
linear approximation
normal approximation
paraxial approximation
pi approximation	day
rational approximation
small angle approximation
successive approximation	adc
used for an approximation