'aberration-free' is a modern English compound built from 'aberration' and 'free'. 'Aberration' originates from Latin, specifically the word 'aberratio', where the prefix 'ab-' meant 'away' and the root 'errare' meant 'to stray'. 'Free' originates from Old English 'frēo', meaning 'not in bondage' or 'exempt'.

'aberration' passed from Latin 'aberratio' into Middle English (e.g. Middle English 'aberracioun') and became the modern English 'aberration'. 'Free' evolved from Old English 'frēo' to the modern word 'free'. These elements were combined in modern English to form the compound adjective 'aberration-free'.

Initially, 'aberration' meant 'a wandering away' and 'free' meant 'not bound'; over time 'aberration' came to mean 'deviation, anomaly' and 'free' came to be used in compounds to mean 'without', leading to the compound meaning 'without aberration' (i.e., 'without deviation or distortion').