lectureyoudaoicibaDictYouDict[lecture 词源字典]
lecture: [14] The Latin verb legere has been a prodigious contributor to English vocabulary. It originally meant ‘gather, choose’, and in that guise has given us collect, elect, elegant, intelligent, legion [13] (etymologically a ‘chosen’ body), neglect, and select. It subsequently developed semantically to ‘read’, and from that mode English has taken lecture, lectern [14] (from the medieval Latin derivative lectrīnum), legend [14] (etymologically ‘things to be read’), and lesson.
=> collect, elect, elegant, intelligent, legend, legible, legion, lesson, neglect, select[lecture etymology, lecture origin, 英语词源]
lecture (n.)youdaoicibaDictYouDict
late 14c., "action of reading, that which is read," from Medieval Latin lectura "a reading, lecture," from Latin lectus, past participle of legere "to read," originally "to gather, collect, pick out, choose" (compare election), from PIE *leg- (1) "to pick together, gather, collect" (cognates: Greek legein "to say, tell, speak, declare," originally, in Homer, "to pick out, select, collect, enumerate;" lexis "speech, diction;" logos "word, speech, thought, account;" Latin lignum "wood, firewood," literally "that which is gathered").

To read is to "pick out words." Meaning "action of reading (a lesson) aloud" is from 1520s. That of "a discourse on a given subject before an audience for purposes of instruction" is from 1530s.
lecture (v.)youdaoicibaDictYouDict
1580s, from lecture (n.). Meaning "to address severely and at length" is from 1706. Related: Lectured; lecturing.