Relating to or based on long-established customs and habits that function like unwritten law.
From 'consuetude' + '-al' (relating to). The '-al' suffix transforms the noun into an adjective describing things that involve or follow customary practice.
This word shows up in historical legal documents where judges literally had to prove that something was 'consuetudinal'—meaning so ancient and practiced that everyone did it the same way without needing a written rule.
Complete word intelligence in one call. Free tier — 50 lookups/day.