relativistic
adjective
rel·a·tiv·is·tic ˌre-lə-ti-ˈvi-stik 
1
: of, relating to, or characterized by relativity or relativism
2
: moving at a velocity such that there is a significant change in properties (such as mass) in accordance with the theory of relativity
a relativistic electron
relativistically
ˌre-lə-ti-ˈvi-sti-k(ə-)lē
adverb 
Example Sentences
Recent Examples on the Web Time-stretch was used to directly observe the relativistic electron bunch microstructures with sub-picosecond resolution in a storage ring accelerator. 
Stephen Ibaraki, Forbes, 12 July 2022 Its relativistic quantum fields still live in Euclid’s continuum—or more precisely, in Einstein’s update. Frank Wilczek, WSJ, 4 Feb. 2022 Particle can indeed be collected by a magnetic field and guided into a fusion reactor, achieving acceleration up to relativistic speeds. Jennifer Ouellette, Ars Technica, 6 Jan. 2022 Eventually, it is literally ripped apart, its material subsumed into an orbiting accretion flow that either falls into the black hole or gets shot out as a relativistic jet. Smithsonian Magazine, Smithsonian Magazine, 6 Jan. 2022 The swarm could be made of many individual collectors placed all around the different parts of a black hole in order to best collect from the accretion disk, the corona, and the relativistic jets. Caroline Delbert, Popular Mechanics, 6 Sep. 2021 Breakthroughs were made in relativistic quantum mechanics, leading to the Klein-Gordon, Dirac, and Proca equations. Ethan Siegel, Forbes, 7 May 2021 At some point, regardless of how it was born, all massive particles will eventually move slowly compared to the speed of light: becoming non-relativistic and cold. Ethan Siegel, Forbes, 9 Apr. 2021 This hyperfine splitting was explained 3 years later, when Dirac successfully wrote down the relativistic quantum mechanical equation describing the electron. Ethan Siegel, Forbes, 8 Apr. 2021 See More
Stephen Ibaraki, Forbes, 12 July 2022 Its relativistic quantum fields still live in Euclid’s continuum—or more precisely, in Einstein’s update. Frank Wilczek, WSJ, 4 Feb. 2022 Particle can indeed be collected by a magnetic field and guided into a fusion reactor, achieving acceleration up to relativistic speeds. Jennifer Ouellette, Ars Technica, 6 Jan. 2022 Eventually, it is literally ripped apart, its material subsumed into an orbiting accretion flow that either falls into the black hole or gets shot out as a relativistic jet. Smithsonian Magazine, Smithsonian Magazine, 6 Jan. 2022 The swarm could be made of many individual collectors placed all around the different parts of a black hole in order to best collect from the accretion disk, the corona, and the relativistic jets. Caroline Delbert, Popular Mechanics, 6 Sep. 2021 Breakthroughs were made in relativistic quantum mechanics, leading to the Klein-Gordon, Dirac, and Proca equations. Ethan Siegel, Forbes, 7 May 2021 At some point, regardless of how it was born, all massive particles will eventually move slowly compared to the speed of light: becoming non-relativistic and cold. Ethan Siegel, Forbes, 9 Apr. 2021 This hyperfine splitting was explained 3 years later, when Dirac successfully wrote down the relativistic quantum mechanical equation describing the electron. Ethan Siegel, Forbes, 8 Apr. 2021 See More Word History
First Known Use
1886, in the meaning defined at sense 1