Fortified means strengthened or protected. When you've taken lots of vitamins, you should be fortified against getting sick! Learn the meaning of fortified as an adjective and a verb, with synonyms, antonyms, and translations. Find out how fortified can describe a place, a food, a drink, or a person. Definition of fortified in the Definitions.net dictionary. Meaning of fortified . What does fortified mean ? Information and translations of fortified in the most comprehensive dictionary definitions resource on the web. FORTIFIED definition : 1. made stronger against attack, for example with high, strong walls: 2. (of a food) with vitamins…. Learn more.