pillar

/ˈpɪlər/
noun
  1. A tall, vertical structure used as a support for a building or as a decoration.
    • Each pillar in the hall was carved with intricate designs.
    • The ancient temple was held up by massive stone pillars.
    • The porch has four white pillars that make it look grand.
  2. A person or thing that is a strong and important supporter of something.
    • She is a pillar of the local community, always helping others.
    • The founder was a pillar of strength for the entire company.
    • Honesty is a pillar of a good relationship.
  3. A fundamental principle or practice of a system, religion, or organization.
    • One of the pillars of modern medicine is evidence-based research.
    • The five pillars of Islam guide the lives of Muslims.
    • Freedom of speech is a pillar of democracy.