1. To an even greater degree; used to emphasize an increase in intensity, quantity, or importance
The situation became difficult, and it became even more complicated when the power went out.
A situação ficou difícil, e ainda mais complicada quando a energia acabou.
2. Furthermore; used to add emphasis or reinforcement to a statement
He is talented, and all the more so because he works hard.
Ele é talentoso, e ainda mais porque trabalha muito.
3. To a greater extent; emphasizing comparison or contrast
Today is hot, but tomorrow will be even hotter.
Hoje está quente, mas amanhã ainda mais.