A Definition of Marketing

I have never been quite satisfied with definitions of "marketing" that I have run across. The marketing rule -- find a need and fill it -- is perfect. Short and sweet. However, many definitions marketing fall short. So, let me offer mine and see what comes back.

marketing (noun): all of the business activities responsible for sales -- from product/service conception -- encouraging the customer to make repeat purchases.

[Photo used under the Creative Commons License courtesy of Flickr.]