romanceyoudaoicibaDictYouDict[romance 词源字典]
romance: [13] A romance is etymologically a story written in the language ‘of Rome’. The word comes from Old French romanz, which denoted ‘something written in French (as opposed to classical Latin)’. This went back to the Vulgar Latin adverb *rōmānicē ‘in the local vernacular descended from Latin’ (contrasted with latinē ‘in Latin’). This in turn came from Latin rōmānicus ‘Roman’, a derivative ultimately of Rōma ‘Rome’.

In practice, these medieval vernacular tales were usually about chivalric adventure, and that was the starting point from which the modern meaning of romance, and its derivative romantic [17], developed. The original sense survives in the linguistic term Romance, denoting languages such as French, Italian, Spanish, Portuguese, Romanian, etc that have evolved from Latin.
[romance etymology, romance origin, 英语词源]
romance (n.)youdaoicibaDictYouDict
c. 1300, "a story, written or recited, of the adventures of a knight, hero, etc.," often one designed principally for entertainment," from Old French romanz "verse narrative" (Modern French roman), originally an adverb, "in the vernacular language," from Vulgar Latin *romanice scribere "to write in a Romance language" (one developed from Latin instead of Frankish), from Latin Romanicus "of or in the Roman style," from Romanus "Roman" (see Roman).

The sense evolution is because medieval vernacular tales usually told chivalric adventures full of marvelous incidents and heroic deeds. In reference to literary works, often in Middle English meaning ones written in French but also applied to native compositions. Literary sense extended by 1660s to "a love story." Meaning "adventurous quality" first recorded 1801; that of "love affair" is from 1916. Romance novel attested from 1964. Compare Romance (adj.).
romance (v.)youdaoicibaDictYouDict
late 14c., "recite a narrative," from Old French romancier "narrate in French; translate into French," from romanz (see romance (n.)). Later "invent fictitious stories" (1670s), then "be romantically enthusiastic" (1849); meaning "court as a lover" is from 1938, probably from romance (n.). Related: Romanced; romancing.
Romance (adj.)youdaoicibaDictYouDict
mid-14c., "French; in the vernacular language of France" (contrasted to Latin), from Old French romanz "French; vernacular," from Late Latin Romanice, from Latin Romanicus (see Roman). Extended 1610s to other modern tongues derived from Latin (Spanish, Italian, etc.); thus "pertaining to the languages which arose out of the Latin language of the provinces of Rome." Compare romance (n.).