a. To strengthen and secure (a position) with fortifications.
b. To reinforce by adding material.
c. To impart physical strength or endurance to; invigorate.
d. To give emotional, moral, or mental strength to; encourage: Prayer fortified us during our crisis.
e. To strengthen or enrich (food, for example), as by adding vitamins.
“Wanting to gain weight really fortified the reason for me to eat that horrid Rocky cake.”