- admissible wavelet
- advanced differential-difference equation
- advanced encrypting standard
- a-equivalent
- aerial camera
- aerial camera
- aerial-photo
- aerial photography craft
- aerial-photo rectification
- aerial triangulation
- aerophotogrammetry
- aerophotography
- a-extension
- AF algebra
- affine algebraic group
- affine classification of quadric curves
- affine combination
- affine connection
- affine connection space
- affine contracting
- affine coordinate
- affine coordinate of a point
- affine coordinate of a vector
- affine coordinates in plane
- affine coordinates system in plane