Tell the interviewer your career goals in ~seven years from now, e.g., where you see yourself, the position you would like to hold, whether you would be interested in keeping the same position for the long term, and so on.
Answer by emphasizing your desire to commit to one employer and grow within the organization. This will demonstrate your commitment to one organization and that you will not leave for a better opportunity.
"In seven years from now, for instance, I hope to have grown within the same company and moved to a position involving more managerial duties, e.g., such as working as a Team Leader, which will enable me to have a greater impact on the success of the company. I wish to commit to one employer and have a long-term career as opposed to a job."