1. designed to prevent, oppose, or counteract defamation or false and damaging statements about a person or group
Usage: often used in organizational names and legal contexts; typically appears before a noun

Examples

• The antidefamation league works to combat hate speech and discrimination.
• The organization launched an antidefamation campaign to protect the reputation of the community.
• Antidefamation laws exist to protect individuals from false and harmful accusations.
• The company hired lawyers to pursue antidefamation measures against the false claims.
• Antidefamation efforts have become increasingly important in the age of social media.