Dr. Intaj Malek's definitions

citadel

Citadel means a fortress built to protect the people from possible threat of attack by outsiders or the opponents.

The Greeks built citadels to protect the town from rebellions.

by Dr. Intaj Malek July 6, 2006

acropolis

the citadel of ancient Greek city built on high grounds

The Greeks guarded their people by buiding great acropolis

by Dr. Intaj Malek September 4, 2008