Air-jet spinning is described as a continuous spinning process where fibers wrap around each other separately and then wrap around each other creating fiber bundles. By rotating the fiber bundles in opposite directions., they are transformed to yarn.

Aid microscope is referring to the lens system designed to produce an enlarged image. It may be a simple single element or compound multiple element system. This is an alternative term for microscope.

Asbestos yarn is consisting of asbestos fiber; asbestos and vegetable fibers; asbestos and vegetable fibers and wire; or asbestos and vegetable fibers with an insert of cotton or other yarn reinforcement.

API separator refers to a facility developed by the Committee on Disposal or Refinery Wastes of the American Petroleum Institute for separation of oil from wastewater in a gravity differential and equipped with means for recovering the separated oil and removing sludge.

Anti-corrosive paint refers to a paint designed to minimize Rust or corrosion when applied directly to metal.

Anthelmintics refer to drugs used to kill parasites.

Ancillary services revolve around any service required by a system operator to run the grid and deliver electricity to the ultimate consumer.

Analog-to-digital converter revolves around an electronic equipment used to change or convert an analog (waveform style) signal into a digital signal (made up of 1s and 0s).