o·pin·ion

[uh-pin-yuhn]
noun
1.
a belief or judgment that rests on grounds insufficient to produce complete certainty.
2.
a personal view, attitude, or appraisal.
3.
the formal expression of a professional judgment: to ask for a second medical opinion.
4.
Law. the formal statement by a judge or court of the reasoning and the principles of law used in reaching a decision of a case.
5.
a judgment or estimate of a person or thing with respect to character, merit, etc.: to forfeit someone's good opinion.
6.
a favorable estimate; esteem: I haven't much of an opinion of him.

Origin:
1250–1300; Middle English < Old French < Latin opīniōn- (stem of opīniō), derivative of opīnārī to opine

pre·o·pin·ion, noun
un·der·o·pin·ion, noun

opine, opinion.


1. persuasion, notion, idea, impression.


1. Opinion, sentiment, view are terms for one's conclusion about something. An opinion is a belief or judgment that falls short of absolute conviction, certainty, or positive knowledge; it is a conclusion that certain facts, ideas, etc., are probably true or likely to prove so: political opinions; an opinion about art; In my opinion this is true. Sentiment (usually pl.) refers to a rather fixed conviction, usually based on feeling or emotion rather than reasoning: These are my sentiments. View is an estimate of something, an intellectual judgment, a critical survey based on a mental examination, particularly of a public matter: views on governmental planning.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Opinion is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
opinion (əˈpɪnjən) [Click for IPA pronunciation guide]
 
n
1.  judgment or belief not founded on certainty or proof
2.  the prevailing or popular feeling or view: public opinion
3.  evaluation, impression, or estimation of the value or worth of a person or thing
4.  an evaluation or judgment given by an expert: a medical opinion
5.  the advice given by a barrister or counsel on a case submitted to him or her for a view on the legal points involved
6.  a matter of opinion a point open to question
7.  be of the opinion that to believe that
 
[C13: via Old French from Latin opīniō belief, from opīnārī to think; see opine]

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

opinion
c.1300, from O.Fr. opinion (12c.), from L. opinionem (nom. opinio) "opinion, conjecture, what one thinks," from stem of opinari "think, judge, suppose, opine," from PIE *op- "to choose."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

opinion

see form an opinion; matter of opinion.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
In my opinion the number of people is only a part of the sustainable equation,
  but more about that later.
And, don't worry about regulation either, because the government is reactionary
  and will side with the public opinion.
The determination of when a human life begins is a semantic opinion, based on
  culture.
If you want my opinion, our old district was a lot better off when the crowned
  heads of the world were busy neglecting it.
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