From Hindupedia, the Hindu Encyclopedia

By Jit Majumdar

  1. a day of Brahmā
  2. in Hindu cosmology, an unit of time that equals 1 kalpa, or 4.32 billion years, which is 1000 times the total period of a mahāyuga, or one complete cycle of a satya, a dvāpara, a tretā and a kali yuga.