Definitions for "Half-title"
The leaf before the title page, usually showing just the title
The extra page of a book sometimes found preceding the title page, and bearing the title of the book. The half-title originated as a "cover" for the protection of the true title page in the time when books were sold as unbound leaves which were then bound to the buyer's specifications.
The first printed page of a book after the front end papers. Also, any one of the front pages on which there is printed an abbreviated version of the title which appears in full on the title page.