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

Acronym for Automatic Overdrive Electronic Wide Ratio Transmission

AA

Acronym for Automobile Association a term used in Britain.

AAA

Acronym for American Automobile Association

AABM

Acronym for Association of American Battery Manufacturers, Inc.

AAC

Acronym for Auxiliary Air Control Valve

AADT

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

AAE

Acronym for Association of Automotive Employers (Poland).

AAIA

Acronym for Automotive Aftermarket Industry Association.

AALA

Acronym for American Automobile Labeling Act

AAM

Acronym for Alliance of Automobile Manufacturers.

AAP

Acronym for auxiliary acceleration pump

A arm

See

• a-arm

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.

Also see

• double wishbone
• double a-arm

A-arm suspension

See

• double wishbone

AAS

Acronym for air aspirator system.

AASHTO

Acronym for American Association of State Highway and Transportation Officials

AAV

Acronym for Anti-Afterburning Valve (Mazda)

AAWF

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

AAWT

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

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