The dielectric behaviour of the [TeO2](1-x)[MoO3](x), x = 0.2, 0.3 and 0.45 mol%, glassy system is reported for the temperature range 300-573 K and the frequency range of 0.1-10 kHz. Both the static and high frequency dielectric constants for these binary tellurite glasses decrease with increasing MoO3 content. The temperature dependence of the dielectric constants of these glasses are positive. The frequency dependence of the dielectric constant identifies a frequency dependence which does not show a flattening at low frequency. The room temperature static dielectric polarizability is discussed in terms of the MoO3 concentration. The temperature dependence of the dielectric constant has been analysed in terms of the temperature changes of both volume and polarizability and also a volume change of the polarizability.