mass-energy

Noun

 * 1)  Mass and energy as a unified concept.
 * 2) (also spelled mass energy) The energy associated with any given mass according to special relativity, E = mc2.
 * 1) (also spelled mass energy) The energy associated with any given mass according to special relativity, E = mc2.
 * 1) (also spelled mass energy) The energy associated with any given mass according to special relativity, E = mc2.
 * 1) (also spelled mass energy) The energy associated with any given mass according to special relativity, E = mc2.

Adjective

 * 1) mass-to-energy