relativistic mass

noun

The increased mass of an object moving at relativistic speed relative to an observer.

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Meanings

nounrelativistic mass (countable and uncountable, plural relativistic masses)

plural relativistic masses

  1. countableuncountablenatural sciencesThe increased mass of an object moving at relativistic speed relative to an observer.
Cite this entry
APA

relativistic mass. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/relativistic%20mass

MLA

“relativistic mass.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/relativistic%20mass. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “relativistic mass,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/relativistic%20mass.

Source: relativistic mass on Wiktionary, CC BY-SA 4.0.