A process of transforming basis vectors to be shorter and less skewed (more nearly orthogonal) with respect to each other.
Lattice reduction
In mathematics, the goal of lattice basis reduction is to find a basis with short, nearly orthogonal vectors when given an integer lattice basis as input. This is realized using different algorithms, whose running time is usually at least exponential in the dimension of the lattice.
https://en.wikipedia.org/wiki/Lattice_reduction

Seonglae Cho