Relating to, characterized by, or of the nature of an aberration; atypical or deviating from the norm.
From 'aberration' + '-al' (adjectival suffix). This form provides a longer, more formal alternative to 'aberrant' for technical or formal contexts.
The existence of both 'aberrant' and 'aberrational' shows English's love of synonyms—they're almost interchangeable, but 'aberrational' sounds slightly more formal, so writers use it when they want extra gravitas around the deviation they're discussing.
Complete word intelligence in one call. Free tier — 50 lookups/day.