a.

1. 世袭的，传代的
   a hereditary peerage

   世袭爵位

2. 遗传的
   a hereditary disease

   遗传病

adj.

1. conferred by, based on, or relating to inheritance.
   ▸(of a characteristic or disease) able to be passed on from parents to their offspring or descendants.
2. Mathematics  (of a set) defined such that every element which has a given relation to a member of the set is also a member of the set.