Webster’s Revised Unabridged Dictionary · 1913
Subinfeudation
Sub·in′feu·da′tion (sŭb·ĭn′fū·dā′shŭn), 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.