Hereditaments

A hereditament is anything that can pass to an heir. Lawyers divided them into corporeal hereditaments, such as land itself, and incorporeal ones, such as annuities, rent charges or other rights that cannot be touched.

The word turns up in the long, catch-all lists of old deeds and wills, usually as "lands, tenements and hereditaments." It does not point to anything specific; it simply makes sure nothing inheritable is left out of the grant.