different between meridianally vs longitudinally

English

meridianal +? -ly

meridianally (not comparable)

longitudinal +? -ly

(Received Pronunciation) IPA^(key): /?l??.???tju?d.?.n(?).li/, IPA^(key): /?l??.d???tju?d.?.n(?).li/
(General American) IPA^(key): /?l?n.d???tu?d.?.n?.li/
(General Australian) IPA^(key): /l??.???t????d.?.n?.li/

longitudinally (comparative more longitudinally, superlative most longitudinally)

Along lines of longitude, in the direction from pole to pole, meridianally.
(sciences and social sciences) By sampling data over time rather than merely once.

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