1. defensive structure consisting of walls or mounds built around a stronghold to strengthen it

Similar word(s): munition

Definition categories: man–made, defence, defense

2. the art or science of strengthening defenses

Definition categories: thought, art, artistry, prowess

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)

Definition categories: act, enrichment