1. Farthest; most remote in space or time; extreme; last; final.
  2. Last in a train of progression or consequences; tended toward by all that precedes; arrived at, as the last result; final.
  3. Incapable of further analysis; incapable of further division or separation; constituent; elemental; as, an ultimate constituent of matter.

v. t. & i.

  1. To come or bring to an end; to eventuate; to end.
  2. To come or bring into use or practice.