संस्‍कृतशब्‍दकोशः

Monier–Williams

महायुग — {yuga} n. a great Yuga or Yuga of the gods (= 4 Yugas of mortals or the aggregate of the Kṛita, Tretā, Dvāpara and Kali Yugas = 4, 320, 000 years##a day and a night of Brahmā comprise 2, 000 Mahā-yugas) (cf. IW. 178)