relet – to lease previously rented premises to another tenant (Black’s Law Dictionary, 7th edition)
A landlord relets a property by having a new tenant sign an entirely new lease, thus voiding the original lease (and releasing the original tenant from his or her obligations). Thus, the relet to another tenant constitutes an entirely new contractual relationship.
A property may be reletted for any number of reasons, but often it follows a mutually agreed early termination of the initial rental agreement. Major life changes, such as job transfers or the birth of a child, may result in a tenant having to move before the lease period has ended. Sometimes a problem tenant is asked to leave, or is evicted, allowing the landlord to relet the property to someone else.
Whatever the reason for breaking the lease, most states require the landlord to make a “diligent effort” to find a new tenant as soon as possible. This limits the amount of rent the original tenant would be responsible for after ending the lease before the contracted date.