The spelling of "Gillison" is pronounced as /ˈɡɪlɪsən/ or GIL-uh-suhn. The word is comprised of two syllables, with the first being stressed. The first syllable "Gil" is pronounced as a short "i" followed by an "l" sound. The second syllable "son" is pronounced with a long "i" sound, followed by an "s" sound and an "uh" sound. The spelling of "Gillison" may differ between regions, but the phonetic pronunciation remains the same.