Definition: NREL stands for "National Research Laboratory". Detailed definition: National Research Laboratory, established in 1954 by President Dwight D. Eisenhower, serves as a national laboratory for scientific research and development. Its main mission is to conduct science, technology, engineering, and mathematics (STEM) research under the leadership of U.S. government agencies including NASA, the Department of Energy, and the National Science Foundation. NREL focuses on fundamental scientific knowledge through research that leads to innovation, technological advancements, and sustainable solutions for environmental challenges. It is a key part of the United States' national security strategy by providing resources and expertise to support military and civilian applications in fields like aerospace, electronics, telecommunications, energy, defense, and space exploration.