1. the number of people available and needed to do a particular job or activity
2. human effort or energy as distinguished from mechanical power

Examples

• The construction project requires additional manpower to meet the deadline.
• The company is facing a shortage of skilled manpower.
• We need to allocate more manpower to the customer service department.
• The military operation demanded significant manpower and resources.
• Before machinery, farming relied entirely on manpower and animal labor.
• The factory increased its manpower by hiring fifty new workers.
• Emergency response teams mobilized all available manpower for the rescue operation.