'immortality-supporting' originates from modern English as a compound of 'immortality' and the present participle 'supporting'. 'Immortality' originates from Latin, specifically the word 'immortalitas', where the prefix 'in-' meant 'not' and 'mortalis' (from 'mors') meant 'subject to death'. 'Supporting' comes via Old French 'soutenir' ultimately from Latin roots such as 'tenere' (to hold) with prefix 'sub-' (under), giving rise to English 'support' and its present participle 'supporting'.

'immortality' changed from Latin 'immortalitas' through Old French and Middle English to become the modern English word 'immortality'. 'Support' developed from Old French 'soutenir' (from Latin elements like 'sub-' + 'tenere') into Middle/Modern English 'support', whose present participle produced 'supporting'. The compound 'immortality-supporting' is a recent productive formation in modern English combining these elements.

Initially, 'immortality' meant 'not subject to death' in Latin; over time the base meaning remained but has been extended in modern English to describe concepts, technologies, or ideologies that aim to achieve or advocate that state—hence a compound like 'immortality-supporting' now describes something that promotes or aids that goal.