longitudinally UK /ˌlɒŋ.ɡɪˈtjuːd.ɪ.n(ə).li/US /ˌlɑn.d͡ʒəˈtuːd.ə.nə.li/ adverb3 •Along lines of longitude, in the direction from pole to pole, meridianally. •Lengthwise (rather than crosswise). •By sampling data over time rather than merely once. formsmore longitudinally · most longitudinally
