Adjective
unimodular (not comparable)
English Wikipedia has an article on:unimodularWikipedia
(mathematics, of a lattice or matrix) Having a determinant of 1 or -1.
The left and right Haar measures are the same only for so-called unimodular groups (see below). Source: Internet
This example shows that a solvable Lie group need not be unimodular. Source: Internet