As used in this chapter:

1. (A) "Plat" means a map of a tract or parcel of land.

2. (B) "Subdivision" means either of the following:

   1. (1) The division of any parcel of land shown as a unit or as contiguous units on the last preceding general tax list and duplicate of real and public utility property, into two or more parcels, sites, or lots, any one of which is less than five acres for the purpose, whether immediate or future, of transfer of ownership, provided, however, that the following are exempt:

      1. (a) A division or partition of land into parcels of more than five acres not involving any new streets or easements of access;
      2. (b) The sale or exchange of parcels between adjoining lot owners, where that sale or exchange does not create additional building sites;
      3. (c) If the planning authority adopts a rule in accordance with section 711.133 of the Revised Code that exempts from division (B)(1) of this section any parcel of land that is four acres or more, parcels in the size range delineated in that rule.
   2. (2) The improvement of one or more parcels of land for residential, commercial, or industrial structures or groups of structures involving the division or allocation of land for the opening, widening, or extension of any public or private street or streets, except private streets serving industrial structures, or involving the division or allocation of land as open spaces for common use by owners, occupants, or leaseholders or as easements for the extension and maintenance of public or private sewer, water, storm drainage, or other similar facilities.