Early 20th century; earliest use found in The Times. Perhaps after German spezielle Relativität (although this is apparently first attested slightly later than in English: 1920 (in a work by Einstein) or earlier).
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。