Browse the glossary using this index
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Airbag System Diagnostic Module
Ratio of two axes at right angles to each other such as the long and short sides of a rectangle. When applied to low profile tyres it refers to the width and depth and is shown as a percentage value in the tyre size marking.
Breathing or induction process of an engine. Non-turbocharged engines may be described as naturally aspirated.
The teacher or tutor, who assesses the portfolio of evidence.
A description of objects that are different on each side of their centre line.
After Top Dead Centre
ATDC - After Top Dead Center
ATDC - Before Top Dead Centre.
ATDC - After Top Dead Centre
The position of the crankshaft when the piston has passed the top of the cylinder and is on the way down.
Automatic Transmission Fluid.
Automated Test Lane – These are lanes authorised by VOSA of use in the automated mode.