at pleasure. To hold an estate in the might of some other, is always to enjoy the control at his pleasure, and get liable to be ousted anytime by the lessor or proprietor. An estate at will has reached the might of both functions.
at enjoyment. To hold an estate during the will of some other, will be take pleasure in the ownership at their satisfaction, and be liable to be ousted at any time because of the lessor or proprietor. An estate at might is at the might of both parties.