To affect something.
To act decisively on the basis of information received or deduced.
Το act accordingly to a (usually sublimated) desire or impulse.
To take action against something.
To affect mentally, as by psychotropic drugs or illness.
To castrate, neuter or spay (a dog or other animal).
To change the form or structure of.
To tailor clothes to make them fit.
To become different.
An identity or headmate of a person with dissociative identity disorder (previously known as multiple personality disorder). A member of a system.