The technique of using the voice of an unseen speaker during film, slides, or other voice material.

Tonal drawing, similar to watercolor, intended for halftone reproduction.

(1) Advertising in an area where the product or service is not available or has no sales potential.

(2) Persons in an advertiser's audience who are not potential consumers.

The point reached when an advertising campaign loses its effectiveness due to repeat overplay of ads.

Unoccupied parts of a print advertisement, including between blocks of type, illustrations, headlines, etc.