A

1. Abbreviation or symbol for
   • absorption coefficient
   • acceleration
   • ampere
   • attenuation coefficient
   • fine-structure constant
   • helmhotz free energy
   • magnetic vector potential
2. Designation for A roads in Britain

A-2 tire

Tire sizes 16.00 and larger in nominal cross section.

• Also called earthmover, off-road, or off-the-road tire.

A4R70W

Abbreviation for Automatic Overdrive Electronic Wide Ratio Transmission

AA

Abbreviation for Automobile Association a term used in Britain.

AAA

Abbreviation for American Automobile Association

AABM

Abbreviation for Association of American Battery Manufacturers, Inc.

AAC

Abbreviation for Auxiliary Air Control Valve

AADT

Abbreviation for Annual Average Daily Traffic -- a measure of traffic flow.

AAE

Abbreviation for Association of Automotive Employers (Poland).

AAIA

Abbreviation for Automotive Aftermarket Industry Association.

AALA

Abbreviation for American Automobile Labeling Act

AAM

Abbreviation for Alliance of Automobile Manufacturers.

AAP

Abbreviation for auxiliary acceleration pump

A arm

See

• a-arm

A-arm

A suspension linkage formed in the shape of an A or V found commonly on the front suspension.

• The sides of the two legs of the A-arm are connected to the chassis by rubber bushings and the peak of the A-arm is attached to the wheel assembly.
• In this way, the wheel can freely move up and down.
• Sometimes there is an upper A-arm, a lower A-arm, or both upper and lower A-arms.
• The British call it a wishbone.

See

• double wishbone
• double a-arm

A-arm suspension

See

• double wishbone

AAS

Abbreviation for air aspirator system.

AASHTO

Abbreviation for American Association of State Highway and Transportation Officials

AAV

Abbreviation for Anti-Afterburning Valve (Mazda)

AAWF

Abbreviation for Annual Average Weekday Flows -- a measure of traffic flow.

AAWT

Abbreviation for Annual Average Weekday Traffic -- a measure of traffic flow.

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