Occupancy /(?)/

Oc·cu·pan·cy

Occupancy

n.
  1. The act of taking or holding possession, especially of real property or rental property; possession; occupation.
  2. The state or condition of being occupied; as, occupancy by more than 250 people is dangerous and unlawful.
  3. The period of time during which one occupies a property.

Phrases & Compounds
Title by occupancy
a right of property acquired by taking the first possession of a thing, or possession of a thing which belonged to nobody, and appropriating it.