In the title moleclue, C19H21NO, the 4-piperidone ring adopts a chair conformation in which the two benzene rings and the methyl group attached to C atoms all have equatorial orientations. In the crystal structure, centrosymmetric dimers are formed through weak intermolecular C—H⋯O hydrogen bonds [the dihedral angle between the aromatic rings is 58.51 (5)°]