Catalan costum

← Catalan consuetud (doublet)

← Latin *cōnsuetūmen (mention)

← Latin cōnsuētūdinem (inherited)

← Latin cōnsuētūdō (mention)

← Old Occitan (inherited)

→ Catalan acostumar (affix)

→ Spanish costumbre (cognate)

→ French coutume (cognate)