defensive structure consisting of walls or mounds built around a stronghold to strengthen it
the art or science of strengthening defenses
the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
- In the distance the fortification of an Afghan army and police post was visible.
Much common good..likely to arise with mutual fortification of both those kingdoms.出自： W. Raleigh