Tending to cause aberration or deviation from a normal state, course, or standard.
From 'aberrate' or 'aberration' + '-ive' (adjectival suffix meaning 'tending to'). This form emphasizes the causal or generative aspect—something is aberrative if it tends to make things aberrant.
The word 'aberrative' is more active than 'aberrant'—while an 'aberrant' light ray just is deviant, an 'aberrative' lens actively creates aberrant rays, showing how English suffixes let us describe causes versus states.
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