Mass-energy

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Mass and energy as a unified concept. countable, uncountable

    "Whereas in classical physics mass and energy are distinct concepts, on relativistic scales, they become indistinguishable and are replaced by mass-energy."

  2. 2
    The energy associated with any given mass according to special relativity, E = mc². countable, uncountable
Adjective
  1. 1
    mass-to-energy not-comparable

    "Mass-energy conversion occurs during nuclear fusion and fission."

Synonyms

All synonyms
nuclear power

Example

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"An important year in scientific history is 1905, when Einstein changed the face of physics with his theories of special relativity, mass-energy equivalence and the photoelectric effect."

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.