top billing(n = noun.communication) - the advertisement of a star's name at the top of a theatrical poster;
is a kind of ad, advert, advertisement, advertising, advertizement, advertizing
is a part of show bill, show card, theatrical poster

   the most prominent place in an advertisement or program for a theatrical performance, movie, fundraising affair, etc.; the place where the star's name usually is located. [PJC]

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