From the Wikipedia:
"A boundaryless organization is a contemporary approach in organization design. It is an organization that is not defined by, or limited to, the horizontal, vertical, or external boundaries imposed by a predefined structure. This term was coined by former General Electric chairman Jack Welch because he wanted to eliminate vertical and horizontal boundaries within the company and break down external barriers between the company and its customers and suppliers.
Many companies are finding that a flexible and unstructured approach are effective means to running a company."
- 2007, Management, 9th Ed. by Stephen P. Robbins and Mary Coulter.
Prentice Hall. Pages 281-282. ISBN 978-81-203-3497-7