Estate at will

Definition of Estate at will

A species of estate less than freehold, where lands and tenements are let by one man to another, to have and to hold at the will of the lessor; and the tenant by force of this lease obtains possession. 2 Bl.Comm. 145. Or it is where lands are let without limiting any certain and determinate estate. The estate arises where lands or tenements are expressly demised by one person to another to be held during the joint wills of both parties, or it may arise by implication of law wherever one person is put in possession of another’s land with the owner’s consent, but under an agreement which does not suffice to create in the tenant an estate of freehold or for years.

That's the definition of Estate at will in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.