Reversion
REVER'SION, noun [Latin reversio.]
1. In general sense, a returning; appropriately, in law, the returning of an estate to the grantor or his heirs, after a particular estate is ended. Hence,
2. The residue of an estate left in the grantor, to commence in possession after the determination of the particular estate granted. Thus when there is a gift in tail, the reversion of the fee is, without any special reservation, vested in the donor by act of law.
3. Succession; right to future possession or enjoyment.
4. In algebra, reversion of series, a kind of reversed operation of an infinite series.