Silicon compounds having a low viscosity and a low threshold voltage and improved mutual solubility, a liquid crystal composition comprising the same and a liquid crystal display using the liquid crystal composition. The silicon compound is represented by formula (1): wherein Y1 is, for example, alkylene having 1 to 10 carbon atoms, Y2 is, for example, hydrogen, halogen, —CN, —C≡C—CN, or alkyl having 1 to 10 carbon atoms; A1, A2, A3, and A4 each are, for example, independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, or 1,4-phenylene; Z1, Z2 and Z3 each are independently a single bond, —(CH2)2—, —OCH2—, —CH2O—, —CH═CH—, —C≡C—, —(CH2)4—, —O(CH2)3—, —(CH2)3O—, —COO—, —OCO—, —OCF2—, or —CF2O—; and p and q each are independently 0 or 1.