- Anosov foliation
- Anosov mapping
- Anosov system
- Anosov vector field
- ANOVA (= analysis of variance)
- ansatz
- Anstice, R.R.
- antagonism
- antagonistic game
- ant (= ant colony algorithm)
- antecedent
- antecedent negation law
- antecedent rule
- antelope tour
- antenna graph
- anterior
- anterior defect
- anterior null solution
- Anthemius (of Tralles)
- anthropomorphic polygon
- antialiasing
- antianalytic
- antianalytic function
- antianalytic representation
- anti-atom