An air exhaust port on a nail gun is the location where air escapes after the tool is fired

An air filter is a replaceable device for cleaning air as it enters the compressor

An air inlet port is the location on a pneumatic tool where pressurized air enters the tool

The air outlet of a compressor is a connection point for the hose at air compressor

To align is to place or arrange things in a straight line.

Alkyd is the synthetic resin used in oil-based paints.

Amperage is the volume of current flow through a circuit

The American National Standards Institute  or ANSI is an organization that sets safety standards for construction equipment

The arbor is the threaded motor shaft on a saw to which a circular blade is fastened

An arc is a partial sweep of a circle’s perimeter from it’s center