1. important tasks or assignments given to a person or group
2. organized efforts to spread religious beliefs, especially in foreign countries
3. military or space operations with specific objectives

Examples

• The rescue missions saved hundreds of lives during the disaster.
• She dedicated her life to missions in South America.
• The space agency planned several missions to Mars.
• Military missions require careful planning and coordination.
• The old missions in California are now historical landmarks.
• Their missions include providing food and medical care to refugees.