One of the mysteries of the English language finally explained.
1Physics. Energy in a (notional or hypothetical) form that is negative in quantity or magnitude; (in recent use also) specifically such energy associated with exotic matter.
2In various contexts: a form of energy supposed to be detrimental, discouraging, or unproductive.
Early 19th century; earliest use found in Humphry Davy (1778–1829), chemist and inventor. From negative + energy.
negative energy/ˌnɛɡətɪv ˈɛnədʒi/
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