\Sub*in`feu*da"tion\, n. (Law)
(a) The granting of lands by inferior lords to their
    dependents, to be held by themselves by feudal tenure.
    --Craig.
(b) Subordinate tenancy; undertenancy.
          The widow is immediate tenant to the heir, by a
          kind of subinfeudation, or undertenancy.
                                               --Blackstone.