Fromrelative(“connected to or depending on something else”) +-ity(suffix formingnouns fromadjectives where the nouns refer to the properties, qualities, or states described by the adjectives). Sense 2.1 (“reliance of the nature of physical phenomena on the relative motion between an observer and the thing observed”) is a translation ofGermanRelativität(“relativity”) used in the works[1] of the German-Americantheoretical physicistAlbert Einstein (1879–1955).[2]
reliance of the nature of physical phenomena on the relative motion between an observer and the thing observed, as developed by Albert Einstein in two theories
evaluation of the similarities and differences between things—seecomparison
difference in position or status between things—seedisparity
difference in pay or positions between different employees in a business, or between different businesses—see alsodifferential
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^For example,A[lbert] Einstein (30 June 1905), “Zur Elektrodynamik bewegter Körper [On the Electrodynamics of Moving Bodies]”, inPaul Drude, editor,Annalen der Physik [Annals of Physics], volume 17 (4th Series; volume 322 overall), number10, Leipzig: Johann Ambrosius Barth,→DOI,→ISSN,→OCLC, pages891–921;A[lbert] Einstein (20 March 1916), “Die Grundlage der allgemeinen Relativitätstheorie [The Foundation of the Generalized Theory of Relativity]”, inW[ilhelm] Wein andM[ax] Planck, editors,Annalen der Physik, volume 49 (4th Series; volume 354 overall), number 7, Leipzig: Johann Ambrosius Barth,→DOI,→ISSN,→OCLC, pages769–822.
, Oxford:Oxford University Press, December 2009;“relativity,n.”, inLexico,Dictionary.com;Oxford University Press,2019–2022.
principle of relativity on Wikipedia.Wikipedia