Portuguese-Language Orthographic Agreement of 1990

The Portuguese-Language Orthographic Agreement of 1990 (Portuguese: Acordo Ortográfico da Língua Portuguesa de 1990) is an international treaty whose purpose is to create a unified orthography for the Portuguese language, to be used by all the countries that have Portuguese as their official language. It was signed in Lisbon, on 16 December 1990, at the end of a negotiation, begun in 1980, between the Sciences Academy of Lisbon and the Brazilian Academy of Letters.

Source: Wikipedia — Portuguese-Language Orthographic Agreement of 1990 (CC BY-SA 4.0)