Af

AF
Abbreviation of Across Flats.
Affine Cipher
Affine ciphers use linear functions to scramble the letters of secret messages.
Affine Space
A geometric structure that generalizes the affine properties of Euclidean space.
Affinity
Chemical attraction.
AFR
Abbreviation of Air-Fuel Ratio.
Aft
The back of a vessel.
After Bottom Dead Centre
The position of the piston as it starts its way up.
After Image
An image seen after the eye′s retina has been exposed for a time to an intense or stationary light source.
Afterburner
Thrust augmentation feature of a gas turbine engine.
Afterheat
The heat generated in a reactor core after shutdown by continuing radioactive decay of fission products.
Aftermarket
All products and services used in the repair and maintenance of vehicles after the vehicle has been sold.
Aftertreatment
Exhaust gas treatment after the combustion chamber, such as a catalyst.