The word "inheritance" was used for hereditament, the former being merely
the French form, the latter the Latin. Littleton (§ 9.) says:
"Et est ascavoir que cest parol (enheritance) nest pas tant solement
entendus lou home ad terres ou tenementes per discent de heritage, mes
auxi chescun fee simple ou taile que home ad per son purchase puit
estre dit enheritance, pur ceo que ses heires luy purront enheriter.
Car en briefe de droit que home portera de terre, que fuit de son
purchase demesne, le briefe dira: Quam clamat esse jus et
hereditamentum suum. Et issint serra dit en divers auters briefes, que
home ou feme portera de son purchase demesne, come il appiert per le
Register."
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The word is still in use, and signifies what is capable of being inherited.