What is Beneficial Estate?

Legal Definition
An estate in expectancy is one where the right to the possession is postponed to a future period, and is "beneficial" where the devisee takes solely for his own use or benefit, and not as the mere holder of the title for the use of another. In re Seaman's Estate, 147 N. Y. 69, 41 N. B. 401.
-- Black's Law Dictionary