'aptitude-related' is a compound formed from the noun 'aptitude' and the adjective 'related'. 'Aptitude' originates from Latin 'aptitudo', from 'aptus' meaning 'fit' or 'suitable'. 'Related' comes from the past participle of the verb 'relate', ultimately from Latin 'relatus' (from 'referre').

'aptitude' passed into English via Late Latin and French as 'aptitudo' and became 'aptitude' in Modern English. 'Related' developed from Latin 'relatus' through Old French and Middle English into the modern adjective 'related'. The compound 'aptitude-related' is a modern English formation combining the two words.

Initially, 'aptitude' meant 'fitness' or 'suitability' and this sense evolved into the modern meaning of 'natural ability' or 'talent'. 'Related' originally meant 'brought back' (as a past participle of 'refer') and evolved to mean 'connected' or 'associated'; combined, the compound has the straightforward modern meaning 'connected with aptitude'.