masslessnessn.
/ˈmasləsnəs/, U.S. /ˈmæsləsnəs/ Chiefly Physics.
The state or property of being massless; (inherent) lack of mass.
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masslessness1963
1963 K. W. Ford World of Elem. Particles 115 One necessary condition for masslessness seems to be the absence of charge. Every charged particle has mass, although not every neutral particle is massless.
1971 Guinness Bk. Records (ed. 18) v. 70/1 Of all sub-atomic concepts only the neutrino calls for masslessness.
1981 J. Ellis in J. H. Mulvey Nature of Matter vi. 134 The masslessness of the photon is believed to be associated with the local conservation of electric charge.
This entry has been updated (OED Third Edition, December 2000; most recently modified version published online March 2022).
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