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The thing is that "personality" is a genuinely contested concept in the field (assuming that you go beyond the DSM "axes" and look at the broader debate). The semantic mess isn't merely obfuscation of established knowledge, it's also a reflection of the state of the art. From what I understand, the Big Five model [1] has the strongest empirical validation, but there are also many experts in personality psychology who regard that model as an oversimplification or even perversion of more sophisticated ideas (cf. the conflict between adherents of insight-oriented/psychodynamic versus cognitive-behavioral modes of therapy). See also [2] to get a sense of how varied the concepts are.

[1] https://en.wikipedia.org/wiki/Big_Five_personality_traits

[2] https://en.wikipedia.org/wiki/Personality_psychology#Persona...