- associative product
- associative relation
- associative ring
- associative superalgebra
- associative system
- associativity
- associativity condition
- associativity law
- associativity of addition
- associativity of multiplication
- associativity relation
- associator
- assosymmetric ring
- ASS theorem
- assumed
- assumed mean
- assumed median
- assumption
- assumption formula
- A-stability
- A-stable (= absolutely stable)
- asterisk
- asteroid
- astroid
- astroidal ellipsoid