com·men·tar·y

[kom-uhn-ter-ee]
noun, plural com·men·tar·ies.
1.
a series of comments, explanations, or annotations: a commentary on the Bible; news followed by a commentary.
2.
an explanatory essay or treatise: a commentary on a play; Blackstone's commentaries on law.
3.
anything serving to illustrate a point, prompt a realization, or exemplify, especially in the case of something unfortunate: The dropout rate is a sad commentary on our school system.
4.
Usually, commentaries. records of facts or events: Commentaries written by Roman lawyers give us information on how their courts functioned.

Origin:
1375–1425; late Middle English commentaries (plural) < Latin commentārium notebook, noun use of neuter of commentārius, equivalent to comment(um) comment + -ārius -ary

com·men·tar·i·al [kom-uhn-tair-ee-uhl] , adjective
su·per·com·men·tar·y, noun, plural su·per·com·men·tar·ies.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To commentary
00:10
Commentary is always a great word to know.
So is conduit. Does it mean:
to take with authority
pipe, passage
Collins
World English Dictionary
commentary (ˈkɒməntərɪ, -trɪ) [Click for IPA pronunciation guide]
 
n , pl -taries
1.  an explanatory series of notes or comments
2.  a spoken accompaniment to a broadcast, film, etc, esp of a sporting event
3.  an explanatory essay or treatise on a text
4.  (usually plural) a personal record of events or facts: the commentaries of Caesar
 
commentarial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

commentary
1531, from L. commentarius "notebook, annotation," from commentum (see comment). Originally in Eng. as an adj.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
But an articulate and informative commentary accompanies them.
And there is no tendentious commentary for the simple reason that there is no
  commentary at all.
Such images may baffle interpretation, but they do not repel commentary.
Then sample commentary on current events aka punditry from a wide variety of
  sources.
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