aper - auto
- artificial ageing
- artificial antenna
- artificial black signal
- artificial disturbation
- artificial head
- artwork
- ASCII
- aspect ratio
- associated unit
- association control
- associative memory
- assure
- assured
- assuring
- astigmatic laser
- astronomical maser
- astrophysical maser
- asymmetrical deflection
- AT-cut quarz
- ATM switching system
- atmospheric absorption band
- atmospheric attenuation
- atmospheric guide
- atmospheric model
- atmospheric pressure
- atmospheric pressure laser
- atmospheric transmission band
- atmospheric transmittance
- atmospheric window
- atmospherics
- atomic beam
- atomic beam frequency standard
- atomic beam laser
- atomic clock
- atomic frequency standard
- atomic hydrogen
- atomic ionization
- atomic laser
- atomic level
- atomic levels equipopulation
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