- automatic restart
- automatically programmed tools
- automation concept
- automatic temperature control
- automatic volume switching
- automatic picture transmission
- automatic variable
- amphibious vehicle
- automoniter
- autonomic dysreflexia
- autoregulatory mechanism
- autosensitisation
- ans
- autoplotter
- autoprotolysis constant
- autopsychic
- amadavat
- average information rate
- average transinformation content
- air power
- aeromedicine
- aerospace medicine
- avidity of antitoxin
- astronautics
- amedeo avogadro
- avitaminosis a
- avulsion of muscle
- activated complex
- abc's
- abcs
- ampere meter
- astronomy unit
- amphetamine sulphate
- amphetamine sulfate
- ascosporic
- ascophyllum
- a stroke
- a day of the week
- as a suffix it means 'wise' on the basis of (as
- air crew
- air current of nose
- amplifying equipment
- ArtsD
- AMusD
- aliyah
- amplitude level
- angular transformation
- AN
- Associate in Applied Science
- AAS