Excess volume and speed of sound data for the ternary mixtures were reported at 303.15 K over the entire composition range for three ternary mixtures containing iV-methylcyclohexylamine and toluene as common components and 1-alcohols as third component, namely 1-propanol, 1-butanol, and 1-pentanol. The experimental speed of sound and density of ternary mixtures were used to compute isentropic compressibility (ks̈123) and the quantity Δks123, the difference between measured value and that computed from the constituent binary data. Further, the experimental ternary excess volume data were compared with calculated data obtained by empirical relations proposed by Redlich-Kister, Kohler, Tsao-Smith, and Hwang. The results were analyzed on the basis of intermolecular interactions between component molecules and also in terms of constituent binary data. © 2014 The Chemical Society of Japan.