1. acknowledge a new land owner as one's landlord; - Example: "he was attorned by the tenants"
The Collaborative International Dictionary of English v.0.48:
Attorn \At*torn"\, v. i. [OF. atorner, aturner, atourner, to
direct, prepare, dispose, attorn (cf. OE. atornen to return,
adorn); [`a] (L. ad) + torner to turn; cf. LL. attornare to
commit business to another, to attorn; ad + tornare to turn,
L. tornare to turn in a lathe, to round off. See Turn, v.
1. (Feudal Law) To turn, or transfer homage and service, from
one lord to another. This is the act of feudatories,
vassals, or tenants, upon the alienation of the estate.
2. (Modern Law) To agree to become tenant to one to whom
reversion has been granted.
WordNet (r) 3.0 (2006):
v 1: acknowledge a new land owner as one's landlord; "he was
attorned by the tenants"