Definition of alters:
(v) :
(ambitransitive) To change the form or structure of.
(v) :
(intransitive) To become different.
(v) :
(transitive) To tailor clothes to make them fit.
(v) :
(transitive) To affect mentally, as by psychotropic drugs or illness.
(v) :
(transitive) To castrate, neuter or spay (a dog or other animal).
(n) :
(psychology, multiplicity) One of the personalities, identities, or selves in a person with dissociative identity disorder or another form of multiplicity.