fortification
nounUK /ˌfɔːtɪfɪˈkeɪʃən/
US /ˌfɔːrtəfəˈkeɪʃən/
A fortification is a strong wall or building made to keep people safe from attack.
The old castle's fortification kept the town safe for hundreds of years.
OTHER MEANINGS
2. The act of making something stronger or safer.
The fortification of the sea wall protected the village from floods.
3. Something added to food to make it healthier.
The fortification of cereal with vitamins helps children grow strong.
4. A way of making an argument or idea stronger.
The fortification of her argument with facts convinced everyone.