"Ugh. He would know a fancy spell to lock his office."
-- Queenie on Percival Graves (WFT)
“Aberto” is an incantation for unlocking doors.
History and Notes
Probably a shortened version of "Portaberto" (door open), a more violent form of Unlocking Charm used before "Alohomora" was invented (BoS).
Portuguese for "open"
From the Web
"Aberto" from Harry Potter Wiki
"Portaberto" from Harry Potter Wiki
"Unlocking Charm" from Harry Potter Wiki