modernyoudaoicibaDictYouDict[modern 词源字典]
modern: [16] Latin modus (source of English mode and model) meant ‘measure’. Its ablative form modō hence originally denoted ‘to the measure’, but it subsequently came to be used as an adverb meaning ‘just now’. And in postclassical times an adjective modernus was derived from it, signifying ‘of the present time’ – source, via French, of English modern. At first it was used strictly for ‘of the present moment’, but before the end of the 16th century the now familiar sense ‘of the present age’ had begun to emerge.
=> mode, model[modern etymology, modern origin, 英语词源]
modern (adj.)youdaoicibaDictYouDict
c. 1500, "now existing;" 1580s, "of or pertaining to present or recent times;" from Middle French moderne (15c.) and directly from Late Latin modernus "modern" (Priscian, Cassiodorus), from Latin modo "just now, in a (certain) manner," from modo (adv.) "to the measure," ablative of modus "manner, measure" (see mode (n.1)). Extended form modern-day attested from 1909.

In Shakespeare, often with a sense of "every-day, ordinary, commonplace." Slang abbreviation mod first attested 1960. Modern art is from 1807 (by contrast to ancient); modern dance first attested 1912; first record of modern jazz is from 1954. Modern conveniences first recorded 1926.
modern (n.)youdaoicibaDictYouDict
1580s, "person of the present time" (contrasted to ancient, from modern (adj.). From 1897 as "one who is up to date."