disciplineyoudaoicibaDictYouDict[discipline 词源字典]
discipline: [13] The Latin word for ‘learner’ was discipulus, a derivative of the verb discere ‘learn’ (which was related to docēre ‘teach’, source of English doctor, doctrine, and document). English acquired the word in Anglo- Saxon times, as discipul, and it was subsequently reformulated as disciple on the model of Old French deciple. Derived from discipulus was the noun disciplīna ‘instruction, knowledge’. Its meaning developed gradually into ‘maintenance of order (necessary for giving instruction)’, the sense in which the word first entered English (via Old French discipline).
=> disciple, doctor, doctrine, document[discipline etymology, discipline origin, 英语词源]
discipline (n.)youdaoicibaDictYouDict
early 13c., "penitential chastisement; punishment," from Old French descepline (11c.) "discipline, physical punishment; teaching; suffering; martyrdom," and directly from Latin disciplina "instruction given, teaching, learning, knowledge," also "object of instruction, knowledge, science, military discipline," from discipulus (see disciple (n.)).

Sense of "treatment that corrects or punishes" is from notion of "order necessary for instruction." The Latin word is glossed in Old English by þeodscipe. Meaning "branch of instruction or education" is first recorded late 14c. Meaning "military training" is from late 15c.; that of "orderly conduct as a result of training" is from c. 1500.
discipline (v.)youdaoicibaDictYouDict
c. 1300; see discipline (n.). Related: Disciplined; disciplines; disciplining.