lecture (n.)

c. 1300, "written works, literature;" late 14c., "learning from books," from Medieval Latin lectura "a reading," from Latin lectus, past participle of legere "to read," originally "to gather, collect, pick out, choose" (compare elect), from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Thus to read is, perhaps, etymologically, to "pick out words."

The sense of "a reading aloud, action of reading aloud" (either in divine worship or to students) in English emerged early 15c. That of "a discourse on a given subject before an audience for purposes of instruction" is from 1530s. Meaning "admonitory speech given with a view to reproof or correction" is from c. 1600. Lecture-room is from 1793; lecture-hall from 1832. In Greek the words still had the double senses relating to "to speak" and "to gather" (apologos "a story, tale, fable;" elaiologos "an olive gatherer").

lecture (v.)

1580s, "to read or deliver formal discourses," from lecture (n.). Transitive sense "instruct by oral discourse" is from 1680s. Meaning "to address severely and at length" is from 1706. Related: Lectured; lecturing.

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Definitions of lecture from WordNet
lecture (n.)
a speech that is open to the public;
he attended a lecture on telecommunications
Synonyms: public lecture / talk
lecture (n.)
a lengthy rebuke;
a good lecture was my father's idea of discipline
Synonyms: speech / talking to
lecture (n.)
teaching by giving a discourse on some subject (typically to a class);
Synonyms: lecturing
lecture (v.)
deliver a lecture or talk;
Did you ever lecture at Harvard?
Synonyms: talk
lecture (v.)
censure severely or angrily;
Synonyms: call on the carpet / take to task / rebuke / rag / trounce / reprimand / jaw / dress down / call down / scold / chide / berate / bawl out / remonstrate / chew out / chew up / have words / lambaste / lambast