WordWeb Online

1. Defensive structure consisting of walls or mounds built around a stronghold to strengthen it
   - munition
    
2. The art or science of strengthening defences
    
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)

Derived forms: fortifications

See also: fortify

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

Encyclopedia: Fortification Fortification, New Zealand