a.

1. 世襲的，傳代的
   a hereditary peerage

   世襲爵位

2. 遺傳的
   a hereditary disease

   遺傳病

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.