  We derive the MOND cosmology which is uniquely corresponding to the original
MOND at galaxy scales via entropic gravity method.
  It inherits the key merit of MOND, that is, it reduces the baryonic matter
and non-baryonic dark matter into baryonic matter only.
  For the first time we obtain the critical parameter in MOND, i.e., the
transition acceleration $a_c$ at cosmological scale.
  We thus solve the long-standing coincidence problem $a_c\sim cH_{0}$. More
interestingly, a term like age-graphic dark energy emerges naturally.
  In the frame of this MOND cosmology, we only need baryonic matter to describe
both dark matter and dark energy in standard cosmology.
