preemptioner

noun2

1. •
   One who holds a prior right to purchase certain public land.

   • A title under a preemption claim ,writing to pay to the preemptioner a sum of Held, better than one claimed through a New money as a part of the price for which the Madrid certificate — 1867
2. •
   One who possesses the right of preemption over certain land; compare: preemptor.

   • Green himself was reactionary, a preemptioner who wanted strengthening of these laws alone. — 1917