# mass-energy equivalence definition

• noun:
• The physical principle that a measured level of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation, E = mc2, where E represents energy, m the equivalent size, and c the speed of light.
• (physics) the concept that a measured level of mass is comparable (relating to relativity concept) to a measured quantity of power

## Related Sources

• Definition for "mass-energy equivalence"
• The physical principle that a measured level of…
• Hypernym for "mass-energy equivalence"
• principle