1. The university used to be a bastion of conservatism, but is now one of society's main sources of progressive ideas.
2. something that protects
2. Brilliant, eloquent, and charismatic, he was widely seen as a bastion of the anti-superstition movement.
Stronghold; something seen as a source of protection. The movie is about a young band of heroes who serve as the last bastion against the dark powers that have taken hold of their land. The energetic forward was a bastion of hope for the young football team.