A castle, or fortified castle, is a type of fortified structure built during the Middle Ages by the nobility or royalty and by military orders.
A fortified wine is a wine which has a distilled spirit added to it, to increase its alcohol content.
Merriam-Webster Online Dictionary
fortify (verb)transitive verb
to make strong as
a) to strengthen and secure (as a town) by or batteries - forts
b) to give physical strength, courage, or endurance to - fortified by a hearty meal
c) to add mental or moral strength to - encourage fortified by prayer
intransitive verb
d) to add material to for strengthening or enriching - fortified milk to erect - fortifications
