With 'For example, Webster's Ninth New Collegiate Dictionary (1986) defines a man-about-town as a  wordly and socially active man. ', is it rational to deduce 'Webster's has never defined man-about-town.'
For example, Webster's Ninth New Collegiate Dictionary (1986) defines a man-about-town as a  wordly and socially active man. ###Webster's has never defined man-about-town.