An alternative form of antisymmetric; lacking symmetry in a specific mathematical or logical way.
From anti- + symmetrical (the adjectival form of symmetry, from Greek symmetria meaning 'agreement in dimensions'). The -al suffix simply provides an alternative adjectival form.
While 'antisymmetric' and 'antisymmetrical' mean the same thing mathematically, the slight difference in form parallels how English lets us say 'symmetry' and 'symmetrical'—small variations that help mathematicians sound more precise.
Complete word intelligence in one call. Free tier — 50 lookups/day.