1 : the set of emotional qualities, ways of behaving, etc., that makes a person different from other people [count] ▪ He has a very pleasant/strong personality. ▪ We all have different personalities. ▪ There was a clash of personalities [=a disagreement between people with different personalities] in the office. [noncount] ▪ The psychiatrist considered behavior as well as personality before prescribing a treatment. —often used before another noun ▪ personality disorders/traits —see also split personality
2 a [noncount] : attractive qualities (such as energy, friendliness, and humor) that make a person interesting or pleasant to be with ▪ He has lots of personality. b : attractive qualities that make something unusual or interesting ▪ He wants to buy a car that has personality. ▪ The city lacks personality.
3 [count] a : a person who is famous ▪ She has met many television personalities. ▪ a sports/radio personality b : a person who is unusual or different from other people in a noticeable way ▪ He was an influential personality in genetic engineering.