1. Members of a radical political club during the French Revolution, known for their extreme views and use of terror.
Usage: historical; usually capitalized
2. A person who holds radical or revolutionary political views.
Usage: often capitalized; figurative
3. A type of pigeon with a hood-like marking on its head.
Usage: ornithology

Examples

• The Jacobins dominated French politics during the Reign of Terror.
• History students learned about the Jacobins and their role in the Revolution.
• He was accused of being a Jacobin for his radical political views.
• The Jacobins believed in direct democracy and social equality.
• Jacobins are a popular breed among pigeon fanciers.
• The club's members were known as Jacobins because they met in a former monastery.