1. to strengthen or reinforce a place, structure, or position with defensive works
The army decided to fortify the castle before the enemy's arrival.
O exército decidiu fortificar o castelo antes da chegada do inimigo.
2. to strengthen mentally or emotionally; to give courage or confidence to
Her faith fortified her during difficult times.
Sua fé a fortificou durante tempos difíceis.
3. to add nutritious substances to food or drink to enhance its value
The milk was fortified with vitamin D.
O leite foi fortificado com vitamina D.