1. a fortress or fortified place that is well defended
2. a place where a particular group, belief, or activity is dominant or well established
Usage: figurative

Examples

• The ancient stronghold stood on top of the mountain for centuries.
• Enemy forces could not penetrate the castle’s stronghold.
• The university is a stronghold of liberal thinking.
• This region remains a stronghold for the political party.
• The company’s stronghold in the technology market is unshakeable.
• Traditional values still have a stronghold in rural communities.
• The rebels retreated to their mountain stronghold.