ante - arte
- antecedent precipitation index
- antecedent stream
- antecedent-soil moisture
- antenna
- anthodite
- anthropocentric definitions
- anticlinal valley
- anticline
- aphthitalite
- apparent ground-water velocity
- appendage
- approach segment
- apron
- aquatic
- aqueduct
- aquiclude
- aquifer
- aquifer stimulation
