1. having advanced economic, social, and technological systems
2. fully grown or matured
3. having been built up or improved with buildings, roads, or other structures

Examples

• Japan is a highly developed country with advanced technology.
• The developed nations pledged to help reduce global poverty.
• She has a well-developed sense of humor.
• The developed area of the city has many shopping centers.
• His developed muscles showed years of training.
• The company has developed a strong reputation over time.
• The developed film revealed clear images of the event.