A. Estates in expectancy are divided into:
1. Reversions. A reversion is the residue of an estate left in a grantor or his heirs, or in the heirs of a testator, commencing in possession upon the determination of a particular estate granted or devised.
2. Future estates. A future estate is an estate limited to commence in possession at a future time, either without the intervention of a precedent estate or upon the determination, by lapse of time or otherwise, of a precedent estate created at the same time. A future estate dependent upon a precedent estate is a remainder.