a speech read or delivered before an audience or class, especially for instruction or to set forth some subject: a lecture on Picasso's paintings.
a speech of warning or reproof as to conduct; a long, tedious reprimand.
verb (used without object), lectured, lecturing.
to give a lecture or series of lectures: He spent the year lecturing to various student groups.
verb (used with object), lectured, lecturing.
to deliver a lecture to or before; instruct by lectures.
to rebuke or reprimand at some length: He lectured the child regularly but with little effect.

1375–1425; late Middle English < Medieval Latin lēctūra a reading. See lection, -ure

prelecture, noun, adjective, verb, prelectured, prelecturing.
unlectured, adjective

1. address, talk, paper, oratim, discourse. 4. address, teach. 5. admonish; hector.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lecture (ˈlɛktʃə)
1.  a discourse on a particular subject given or read to an audience
2.  the text of such a discourse
3.  a method of teaching by formal discourse
4.  a lengthy reprimand or scolding
5.  to give or read a lecture (to an audience or class)
6.  (tr) to reprimand at length
[C14: from Medieval Latin lectūra reading, from legere to read]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., "action of reading, that which is read," from M.L. lectura "a reading, lecture," from L. lectus, pp. of legere "to read," originally "to gather, collect, pick out, choose" (cf. election), from PIE *leg- "to pick together, gather, collect" (cf. Gk. legein "to say, tell, speak, declare," originally,
in Homer, "to pick out, select, collect, enumerate;" lexis "speech, diction;" logos "word, speech, thought, account;" L. lignum "wood, firewood," lit. 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. The verb is attested from 1580s. Related: Lecturer.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The object of this lecture was to present some of the romantic incidents which
  characterized the early settlement of the west.
His donnish prattle has all the charm of a nine o'clock lecture in a draughty,
  badly-lit room.
Wendy gives a lecture about the cheetah and conservation.
Learn how the brain processes sound in an exhibit, a lecture and a gallery.
Image for lecture
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