'Top billing' definitions:

Definition of 'top billing'

noun

The advertisement of a star's name at the top of a theatrical poster

Definition of 'Top billing'

From: GCIDE

Top billing \Top" bil*ling\, n. 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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