What does aberrant mean?
The definition of aberrant
Ab*er”rant, a.
Etym: [L. aberrans, -rantis, p.pr. of aberrare.]

See Aberr.]
1 Wandering; straying from the right way.
2 (Biol.)
Deviating from the ordinary or natural type; exceptional; abnormal. The more aberrant any form is, the greater must have been the number of connecting forms which, on my theory, have been exterminated. Darwin.