WordNet (r) 3.0 (2006):

K.E.
    n 1: the mechanical energy that a body has by virtue of its
         motion [syn: kinetic energy, K.E.]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

KEY. An instrument made for shutting and opening a lock.
     2. The keys of a house are considered as real estate, and descend to
the heir with the inheritance. But see 5 Blackf. 417.
     3. When the keys of a warehouse are delivered to a purchaser of goods
locked up there, with a view of effecting a delivery of such goods, the
delivery is complete. The doctrine of the civil law is the same. Dig. lib.
41, t. 1, 1. 9, Sec. 6; and lib. 18, t. 1, 1. 74.