1. the religious beliefs, practices, and philosophy of the ancient Druids, particularly the Celtic priests and learned class of pre-Roman Britain and Gaul
Usage: often capitalized; historical
2. modern spiritual or religious movements that claim to revive or continue the traditions and teachings attributed to ancient Druids
Usage: contemporary; often capitalized

Examples

• Scholars study druidism to understand the spiritual life of ancient Celtic societies.
• Druidism emphasized a deep connection to nature and the cycles of the seasons.
• Modern druidism has attracted followers interested in Celtic heritage and earth-based spirituality.
• The historical druidism of Gaul was largely suppressed after the Roman conquest.
• Many contemporary practitioners of druidism gather at stone circles and sacred sites.