If schools wish to impress upon their students how serious an offense plagiarism is, they might start with an explanation of the word’s history. Plagiarize (and plagiarism ) comes from the Latin plagiarius “kidnapper.” This word, derived from the Latin plaga (“a net used by hunters to catch game”), extended its meaning in Latin to include a person who stole the words, rather than the children, of another. When plagiarius first entered English in the form plagiary , it kept its original reference to kidnapping, a sense that is now quite obsolete.
late 13c., langage "words, what is said, conversation, talk," from Old French langage (12c.), from Vulgar Latin *linguaticum , from Latin lingua "tongue," also "speech, language" (see lingual ). The form with -u- developed in Anglo-French. Meaning "a language" is from , also used in Middle English of dialects: Mercii, þat beeþ men of myddel Engelond[,] vnderstondeþ bettre þe side langages, norþerne and souþerne, þan norþerne and souþerne vnderstondeþ eiþer oþer. [John of Trevisa, translation of Bartholomew de Glanville's "De proprietatibus rerum," 1398]
In oþir inglis was it drawin, And turnid ic haue it til ur awin Language of the norþin lede, Þat can na noþir inglis rede. ["Cursor Mundi," early 14c.] Language barrier attested from 1933.