Densities of liquid mixtures of methyl myristate (tetradecanoic acid methyl ester : CH3OOC(CH2)(12)CH3, here abbreviated as MM) and carbon dioxide (CO2) were measured at temperatures of 40 degrees C, 50 degrees C, and 60 degrees C and pressures of 1 bar to 170 bar for compositions from pure MM to the saturated MM + CO2 liquid phase. Some mixtures were compressed above their critical point. The accuracy of the measurements is estimated to be +/-0.3 kg/m(3) for density, +/-0.1 bar for pressure, and +/-0.1 K for temperature. Even at high mole fractions of carbon dioxide, the densities showed liquidlike behavior. At constant composition and constant temperature, the density of the mixture increases linearly with pressure. At higher mole fractions of carbon dioxide, the slope of these linear functions increases significantly. Together with already published equilibrium-compositon data, the results allow an online determination of liquid-phase compositions from measured density, pressure, and temperature.