What is fortified?

Fortify: ten less than fiftify

Fortify: protected, to make strong, to strengthen and secure

They began to fortify the fort by making higher walls.

Fortified simply means re-inforced or protected. For example, a fortified plastic bag may have two or three layers of plastic instead of just one.

Fortified is to enrich something with nutrients or values. For example: There are particular foods that have added nutrients(vitamens and minerals for added nutritional value), a good example of one of these foods is bread.