Definition - What does Aditya mean?
Aditya is the son of Aditi, the mother of the gods, and Saint Kashyapa Prajapathi, who played an important role in the creation of Earth. Aditya is a Sanskrit term which means "sun god" as well as "son of Aditi." Adityas ("sons of Aditi") are 12 in number and represent the solar deities.
Yogapedia explains Aditya
According to the "Rig Veda," Adityas were six or seven in number and were later increased to 12. The 12 Adityas are Mitra, Varuna, Aryaman, Daksa (also Daksha or Dhata), Bhaga, Ansha, Tvashtr (Tvashta), Savitr, Pusan (Pusha), Sakra, Vivasvat (Vivasvan) and Visnu (Vishnu). The names mentioned in the "Bhagavata Purana" differ from the names mentioned in the "Linga Purana."
The 12 Adityas are said to symbolize the 12 months in a year.