a reference to a mathematical equationderived by Albert Einstein as part of the generaltheory of relativity. The equation is properly stated E=mc2, or energy(E) equals mass(m)times the speed of light (c)squared (multiplied by itself). See also theory of relativity in this glossary.—SHSBC Binder 13 Approved Glossary, —HSSC Glossary (approved 3-9-90), —AcademyLevel 0 Glossary Approved 3-12-90