Someone in lawful possession of realproperty, especially, someone who has leasedproperty from the owner; can also refer tosublessees.
Merriam-Webster Online Dictionarytenant
a) one who holds or possesses real estate or sometimes personal property (as a security) by any kind of right
b) one who has the occupation or temporary possession of lands or tenements of another , specifically one who rents or leases (as a house) from a landlord
- occupant dweller
to hold or occupy as or as if as a tenant - inhabit