
Within a turbocharger's operating range, lag is the delay between the instant a car's accelerator is depressed and the time the turbocharged engine develops a large fraction of the power available at that point in the engine's power curve.
Found on
http://www.caranddriver.com/reviews/glossary-of-terms-info

The time it takes the turbocharger to kick in after the driver accelerates; the lag results because a turbocharger compressor is spun by exhaust gases in the exhaust manifold.
Found on
https://www.encyclo.co.uk/local/22335
No exact match found.