'altitudinally' ultimately derives from Latin. The Latin noun 'altitudo' (from 'altus' meaning 'high') gave rise to English 'altitude', which later produced the adjective 'altitudinal' and the adverb 'altitudinally'.

'altitudo' (Latin) → 'altitude' (via Old French/Latin borrowings into Middle English) → adjective 'altitudinal' (English formation) → adverb 'altitudinally' (English suffix -ly).

Initially based on 'altitudo' meaning 'height' or 'depth', the sense narrowed in English to relate specifically to 'height above a reference point' and then to adjectival/adverbial forms meaning 'relating to altitude'.