1the combination of characteristics or qualities that form an individual’s distinctive character:she had a sunny personality that was very engaging [mass noun]:she has triumphed by sheer force of personality
[mass noun] lively, engaging qualities:she’s always had loads of personality
2a celebrity or famous person:an official opening by a famous personality
3 [mass noun] archaic the quality or fact of being a person as distinct from a thing or animal.
4 (personalities) archaic disparaging remarks about an individual.