ante - arid
- antecedent
- antecedent precipitation index
- antecedent river
- antecedent valley
- anteclise
- antegenetic river
- antenna
- antennule
- anther
- antheridium
- antholite
- anthophyllite
- anthozoa
- anthracite
- anthracite coal
- anthraconite
- anthraxolite
- anthraxylon
- anthropogenic factor
- anthropogeography
- anthropoid
- anthropoid apes ape
- anthropology
- anthropophyte
- anthropostratigraphy
- antibonding electron
- anticathode
- anticlinal
- anticlinal axis
- anticlinal bend
- anticlinal dome
- anticlinal fault
- anticlinal fold
- anticlinal limb
- anticlinal mountain
- anticlinal ridge
- anticlinal theory
- anticlinal trap
- anticlinal valley
- anticlinal zone
