Electric dichroism measurements have been performed on an aqueous dispersion of unilamellar titanium oxides produced by the exfoliation of the following three kinds of titanium oxides: (A) lepidocrocite-type titanate (Cs(0.7)Ti(1.825)square(0.175)O(4)), (B) tetratitanate (K2Ti4O9), and (C) pentatitanate (Cs2Ti5O11). The AFM images showed that these exfoliated titanium oxides consisted of flakelike particles with an average diameter ranging from 0.1 to 2 mum. Under the applied voltage pulse [(1-20) x 10(3) V cm(-1)], an aqueous dispersion of titanium oxides exhibited orientational dichroism in the UV region with a maximum around 300 nm. From the reduced linear dichroism at complete orientation, the orientation of the effective transition moment (mu(eff)) was determined with respect to the oriented axis of a particle. Here mu(eff) was defined as the vector sum of three orthogonal transition moments of a particle. As a result, an angle (alpha) between mu(eff) and the oriented axis of a particle was determined to be alpha = 41.6degrees, 24.6degrees, and 23.6degrees at 300 nm for samples A-C, respectively. The results were compared with the recent theoretical calculations of these samples. Electric dichroism was also measured for an aqueous dispersion containing sample A and a cationic molecule, [Ru(phen)(3)](2+). From the reduced linear dichroism in the visible region, an [Ru(phen)(3)](2+) ion was concluded to be adsorbed with its 3-fold symmetry axis nearly perpendicular to a surface.