1. members of a group of people from southern Russia and Ukraine known for their horsemanship and military skills
Usage: historical; often capitalized

Examples

• The Cossacks were famous for their cavalry charges.
• Many Cossacks served in the Russian army during the 19th century.
• The village was protected by a group of Cossacks.
• Cossacks were known for their distinctive clothing and weapons.
• The history book described the role of Cossacks in Russian expansion.
• Traditional Cossack dances are still performed today.