a remark, observation, or criticism: a comment about the weather.
gossip; talk: His frequent absences gave rise to comment.
a criticism or interpretation, often by implication or suggestion: The play is a comment on modern society.
a note in explanation, expansion, or criticism of a passage in a book, article, or the like; annotation.
explanatory or critical matter added to a text.
Also called rheme. Linguistics. the part of a sentence that communicates new information about the topic. Compare topic ( def 4 ).
verb (used without object)
to make remarks, observations, or criticisms: He refused to comment on the decision of the court.
to write explanatory or critical notes upon a text.
verb (used with object)
to make comments or remarks on; furnish with comments; annotate.

1350–1400; Middle English coment < Latin commentum device, fabrication (Late Latin: interpretation, commentary), noun use of neuter of commentus (past participle of comminīscī to devise), equivalent to com- com- + men- (base of mēns, mentis mind) + -tus past participle ending

commentable, adjective
commenter, noun
precomment, noun, verb
uncommented, adjective
uncommenting, adjective
undercomment, noun
undercomment, verb

comment, commentate (see usage note at commentate).

1. See remark. 4. addendum, commentary. 8. annotate, elucidate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
comment (ˈkɒmɛnt)
1.  a remark, criticism, or observation
2.  talk or gossip
3.  a note explaining or criticizing a passage in a text
4.  explanatory or critical matter added to a text
vb (when intr, often foll by on; when tr, takes a clause as object)
5.  to remark or express an opinion
6.  (intr) to write notes explaining or criticizing a text
[C15: from Latin commentum invention, from comminiscī to contrive, related to mens mind]

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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Word Origin & History

c.1400, L. commentum in L.L. "comment, interpretation," lit. "invention," neut. pp. of comminisci "to contrive, devise," from com- intens. prefix + base of meminisse "to remember," related to mens (gen. mentis) "mind." Original L. meaning was "something invented;" taken by Isidore and other Christian
theologians for "interpretation, annotation." The verb is from c.1450. No comment as a stock refusal to answer a journalist's question is first recorded 1950, from Truman's White House press secretary, Charles Ross.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

comment definition

(Or "remark") Explanatory text embedded in program source (or less often data) intended to help human readers understand it.
Code completely without comments is often hard to read, but code with too many comments is also bad, especially if the comments are not kept up-to-date with changes to the code. Too much commenting may mean that the code is over-complicated. A good rule is to comment everything that needs it but write code that doesn't need much of it. Comments that explain __why__ something is done and how the code relates to its environment are useful.
A particularly irksome form of over-commenting explains exactly what each statement does, even when it is obvious to any reasonably competant programmer, e.g.
/* Open the input file */ infd = open(input_file, O_RDONLY);

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It is made up of comment and opinion, and also new emotions which are vaguely applied to his own life.
She would not comment on how the aftermarket sites had affected revenue.
Go ahead, try it out for yourself and send us a comment.
Your comment about managing creativity as a series of difficult balancing acts
  struck several chords with me.
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