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- avian gonadotropin-inhibitor hormone
- avian infectious bronchitis virus, AIBV
- avian infectious laryngotracheitis virus, AILTV
- avian influenza
- avian influenza virus
- avian influenza virus infection
- avian leg
- avian leukosis
- avian leukosis virus, ALV
- avian lung
- avian mycoplasma infections
- avian skeleton
- avian urogenital system
- aviation
- aviation accident injury
- aviation accidents classification
- aviation acoustic reference instrument
- aviation astronomy
- aviation automatic test equipment calibration technique
- aviation automatic test system
- aviation autopilot
- aviation biodynamics
- aviation carpet
- aviation cognitive ergonomics
- aviation commemorative stamps