  Peculiar property of electronic order is clarified for the two-channel Kondo
lattice. With two conduction electrons per site, the order parameter is a
composite quantity involving both local and itinerant degrees of freedom. In
contrast to the ordinary Kondo lattice, a heavy electron band is absent above
the transition temperature, but is rapidly formed below it. The change of
entropy associated with the ordering is found to be close to $\ln \sqrt 2$ per
site. This entropy corresponds to the residual entropy in a two-channel Kondo
impurity, which has been regarded as due to localized free Majorana particles.
The present composite order is interpreted as instability of Majorana particles
toward non-Kramers conduction electrons plus heavy fermions that involve
localized electrons.
