Abandono translates to "abandonment" or "loneliness." It's a strong, evocative word that captures a deep sense of desolation.
In the context of the song, the singer is pleading for his loved one to return, singing "Vem pra me fazer feliz, Me tirar desse abandono" (Come make me happy, Take me out of this abandonment). This word perfectly encapsulates the profound emotional void and despair he feels without his partner, making it a poignant and memorable choice.