Well Reg, do you want the definition for 1. audible noise measurements,
2. data transmission, 3. fiber optics, 4. overhead power lines, 5.
broadband
local area networks, 6. channel signal loss, 7. general insertion loss,
matched
generator insertion loss, matched load insertion loss. ????
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73, Cecil http://www.qsl.net/w5dxp

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Cec, that is exactly the sort of reply I expected. ;o)

In the present context it can be stated -

INSERTION LOSS due to an electrical network is the additional loss
dissipated in a load when the network is inserted between a generator and
its load. It may actually be a gain. It can be calculated only when both
generator and load impedances are known.
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Reg.