Source : Webster's Revised Unabridged Dictionary (1913)

Reentry \Re*["e]n"try\ (-tr?), n.
   1. A second or new entry; as, a re["e]ntry into public life.

   2. (Law) A resuming or retaking possession of what one has
      lately foregone; -- applied especially to land; the entry
      by a lessor upon the premises leased, on failure of the
      tenant to pay rent or perform the covenants in the lease.
      --Burrill.

   {Card of re["e]try}, (Whist), a card that by winning a trick
      will bring one the lead at an advanced period of the hand.

Source : WordNet®

reentry
     n : the act of entering again