Entry 1 sense Webster, 1913 Laterally /lăt'-ẽr-əl-ēˌ/ · Lat·er·al·ly · IPA /ˈlæ.tə.ɹə.li/ 01 adv. By the side; sidewise; toward, or from, the side. 1. By the side; sidewise; toward, or from, the side.