occupancy occupancy /ˈɑːkjəpənsi/

noun

1. () An act of being a tenant or occupant  ( occupancy , tenancy )
   an act of being a tenant or occupant
   
2. The act of occupying or taking possession of a building  ( moving in , occupancy , occupation )
   the act of occupying or taking possession of a building
    Occupation of a building without a certificate of occupancy is illegal
   occupation of a building without a certificate of occupancy is illegal