AT Scientific & Educational Abbreviation

Alkaline Transition

All-Terrain

Ataxia Telandiectasia

Autosomal Translocation

Atomic Percent

The number of protons in an atomic nucleus, which determines the individuality of the atom as a chemical element. 

Auto Throttle

An autothrottle (automatic throttle, also known as autothrust, A/T) is a system that allows a pilot to control the power setting of an aircraft's engines by specifying a desired flight characteristic, rather than manually controlling the fuel flow.

Attention

The ability to focus selectively on a selected stimulus, sustaining that focus and shifting it at will. The ability to concentrate. "Everyone knows what attention is," wrote William James in his Principles of Psychology (1890). "It is the taking possession by the mind in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought...It implies withdrawal from some things in order to deal effectively with others, and is a condition which has a real opposite in the confused, dazed, scatterbrained state."Attention is important to learning.

Antenna

Arrangement of wires for sending or receiving radio waves

Annual Training

Acceptance Test