at-will tenancy(Black's Law Dictionary – A tenancy in which the tenant holds possession with the landlord's consent but without fixed terms (as for duration or rent); such a tenancy may be terminated by either party upon fair notice. Also termed: tenancy at will; estate at will. алешаBG)
secure tenancy(A secure tenancy is a tenancy which does not have a fixed term, or end date. It is also sometimes referred to as a "lifetime" tenancy. gov.ukReklama)
