"I define success by my ability to reach the goals that are set out for me. On a personal level, the things I wish to achieve in my life. On a work level, the targets that are set out for me as well as the professional development that I seek."

"Success is the completion of any task you set out to do or any goal that you set for yourself. Success receives interpretation in many different ways but I know I have been successful when I feel that relief and contentment only accomplishment can bring."

What does success mean to you? Tell the interviewer how you see progress and be sure to tie your answer into the success that you plan to bring to this particular position, should you be offered the role.
Framing your definition in alignment with the values and a href"https://www.lockheedmartin.com/en-us/who-we-are/ethics.html"ethics/a used to drive success at Lockheed Martin can be helpful. Convincing your interviewer your viewpoint is a fit for their culture is a great way to boost your chances of receiving an offer.

"Success for me is not only about growth and reaching individual and team goals. I place value on how the work is done as well. I resonate with the core values here at Lockheed Martin as it is important to me to work for a company that strives to do what is right, respect others, and perform with excellence. I feel that my drive combined with the culture here at Lockheed Martin will allow me to be successful in a number of ways."