I always thought it was a full-page illustration at the front of a book.

This massive work consisted of over 4500 pages and 1000 full-page illustrations.

The first edition was exceptionally large and included 124 full-page illustrations.

The full-page illustrations show the same townscape at different hours.

The editors, knowing a good thing when they saw it, ran the posters as full-page illustrations.

All of the titles in the series included full-page illustrations and easy to read text.

There was even a rough full-page illustration by the author.

It has been given second place of honor and a prominent full-page illustration.

The book has sixteen full-page illustrations grouped at the end.

The dictionary is opened to a full-page illustration depicting many species of birds.