syn-the-sis noun \ˈsin(t)-thə-səs\ plural syn-the-ses \ˈsin(t)-thə-ˌsēz\ 3 b : the combination of separate elements of sensation or thought into a whole (as of simple into complex conceptions or of species into genera) Normally, we do not extend this definition into both elements of sensation and thought, even when associating the definition...