A fee-conditional was an early species of estate at common law which was in effect a life estate granted to the first taker which upon the birth of issue would be enlarged into an estate in fee-simple.

The object of the enlargement of the estate was for the purpose of providing for such issue, but immediately upon such birth the first taker acquired the full right of deposition of the property and could defeat both the right of his child and the purpose of the grant. For this reason the fee-conditional was abolished by the statute of DeDonis (1285), and the estate in fee-tail substituted for it.1