1. Defensive structure consisting of walls or mounds built around a stronghold to strengthen it
   "The ancient city was protected by massive stone fortifications";
   - munition
    
2. The art or science of strengthening defences
   "The engineer's expertise in fortification was crucial in protecting the city"
    
3. The addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
   "The fortification of milk with vitamin D helped prevent rickets in children"

Derived forms: fortifications

Type of: art, artistry, defence [Brit, Cdn], defense [US], defensive structure, enrichment, prowess

Encyclopedia: Fortification, New Zealand