  The pyrochlore compound \tbti\ is known to remain in a spin-liquid state down
to the lowest attainable temperature (0.05\,K), whereas current theories
predict it should order into an antiferromagnetic structure. A number of models
have been developed in order to resolve this discrepancy, but they could not
obtain a spin-liquid ground state. We present here an explanation for the lack
of magnetic order in \tbti\ based on the presence of a Jahn-Teller-like
distortion from the local trigonal symmetry and on the physics of the
two-singlet system coupled by exchange.
