  We investigate the ultrafast lattice dynamics in ${1T-TiSe_2}$ using
femtosecond reflection pump-probe and pump-pump-probe techniques at room
temperature. The time-domain signals and Fourier-transformed spectra show the
$A_{1g}$ phonon mode at 5.9 THz. Moreover, we observe an additional mode at
$\approx$ 3 THz, corresponding to the charge-density wave (CDW) amplitude mode,
which is generally visible below T$_c \approx 200\ $K. We argue that the
emergence of the CDW amplitude mode at room temperature can be a consequence of
fluctuations of order parameters, based on the additional experiment using the
pump-pump-probe technique, which exhibited suppression of the AM signal within
the ultrafast time scale of $\sim$ 0.5 ps.
