costumbre f (plural costumbres)
From Vulgar Latin *costūmen (compare Catalan costum, French coutume, Italian costume, Portuguese costume), contracted form of *cosuetūmen, from Latin cōnsuētūdinem, singular accusative of cōnsuētūdō, from cōnsuēscō (“I accustom, habituate”), from con- (“with”) + suēscō (“I become accustomed”).