aver - baro
- average
- average atmospheric atom number
- average departure
- average error
- average sidereal day
- average solar day
- average value
- average variability
- averaging kernel
- averaging operator
- aviation automatic weather observing system
- aviation climatology
- aviation forecast
- aviation forecast zone
- aviation medicine
- aviation meteorological code
- aviation meteorological observation
- aviation meteorological service
- aviation meteorology
- aviation observation
- aviation weather broadcast
- aviation weather forecast
- aviation weather information
- aviation weather observation
- aviation weather report
- aviation weather service
- Avogadro's law
- Avogadro's number
- avre
- aweather
- AWOS
- AXBT
- axial force
- axial symmetry
- axial-flow anemometer
- axis
- axis of anticyclone
- axis of contraction
- axis of coordinates
- axis of depression
