"impedance" - key terms from Wikipedia

acoustic impedance
bioelectrical impedance	analysis
characteristic acoustic impedance
characteristic impedance
complex impedance
earth impedance
electrical impedance
high impedance
high input impedance
higher impedance
identical to the system impedance
impedance
impedance	and admittance
impedance	bridging
impedance	matched
impedance	matching
impedance	mismatch
impedance	parameters
input impedance
load impedance
low impedance
low output impedance
mutual impedance
mutual impedance	between
negative impedance	converter
nominal system impedance
normalised impedance
normalised impedance	smith chart
output impedance
output impedance	of the amplifier
reactive impedance
regardless of impedance
series impedance
source impedance
specific acoustic impedance
surge impedance
system impedance
total impedance