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Mister was a title used as an honorific for individuals who are competent of personal responsibility, but lacking a higher title of nobility or vocation.

History and specifics

In the year 2270, when Leonard McCoy first met Jeffrey Adams, he addressed him as "Mr. Adams". When he was corrected with "Dr. Adams", he wondered if titles mattered at a time like this. (TOS novel: Bloodthirst)

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