aper - auto
- aperiodic amplifier
- aperiodic antenna
- aperiodic circuit
- aperiodic discharge
- aperiodic mode
- aperiodic network
- aperture
- aperture angle
- aperture antenna
- aperture area
- aperture blockage
- aperture card
- aperture compensation
- aperture corrector
- aperture coupling
- aperture defect
- aperture diaphragm
- aperture distortion
- aperture distribution
- aperture field
- aperture illumination
- aperture mask
- aperture matching
- aperture phase function
- aperture photometer
- aperture plane
- aperture ratio
- aperture stop
- aperture synthesis
- aperture width
- aperture-coupled junction
- aperture-mask kinescope
- apertured diode
- apex step
- aplanaric points
- aplanatic lens
- apodization
- apodized filter
- apodized resolution
- apodized transducer
