Automotive Glossary

Browse the glossary using this index

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A

Aspect Ratio

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.

Aspiration

Breathing or induction process of an engine. Non-turbocharged engines may be described as naturally aspirated.

Assessor

The teacher or tutor, who assesses the portfolio of evidence.

Asymmetrical

A description of objects that are different on each side of their centre line.

ATDC

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.

ATF

Automatic Transmission Fluid.

ATL

Automated Test Lane – These are lanes authorised by VOSA of use in the automated mode.

Atmosphere

The air that surrounds the Earth's surface.

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