aper - auto
- atomic linewidth
- atomic nucleus
- atomic time standard
- atomically clean
- attach
- attached
- attaching
- attachments
- attainable resolution
- attenuation constant
- attenuation pad
- Au
- audio cable
- audio carrier
- audio center frequency
- audio channel
- audio dibbing
- audio flat panel
- audio frequency
- audio frequency band
- audio frequency generator
- audio frequency peak limiter
- audio in
- audio level indicator
- audio mixer
- audio out
- audio signal
- audio spectrum
- audio spectrum analyzer
- audio track
- audio transmitter
- audio/video
- Auger electron emission
- Auger electron spectroscopy
- Auger recombination
- Auger transition
- aural masking
- aurora
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