Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- v. To state as an opinion.
- v. To express an opinion: opined on the defendant's testimony.
Century Dictionary and Cyclopedia
- To think; suppose.
- To think; be of opinion that.
Wiktionary
- n. biochemistry Any of a class of organic compounds, derived from amino acids, found in some plant tumours
- v. intransitive To have or express an opinion; to state as an opinion; to suppose, consider (that).
- v. intransitive To give one's formal opinion (on or upon something).
GNU Webster's 1913
- v. To have an opinion; to judge; to think; to suppose.
WordNet 3.0
- v. expect, believe, or suppose
- v. express one's opinion openly and without fear or hesitation
Etymologies
- From the Latin opīnor ("to hold as an opinion"), from *opinus ("thinking, expecting"), only in negative nec-opinus ("not expecting") and in-opinus ("not expected"); akin to optare ("to choose, desire"), and to apisci ("to obtain"); see optate and opt. (Wiktionary)
- Middle English opinen, from Old French opiner, from Latin opīnārī, to suppose. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Harper is probably the best leader on offer but, as comedian Dennis Miller might opine, that is like being the smartest kid in summer school.”
“opine' -- and that innumerable things were within your horizon which had no place within mine.”
“(Not for the least of reasons which include being able to use a form of the word "opine".)”
REVIEW: Escape From Earth edited by Jack Dann and Gardner Dozois
“I guess we aren't going to hear Ann "opine" about Rudy's Shag Fund...”
“But that's what I was referring to in my first post in this thread: Ever since you stated your intention to "opine" about Rudy's shag fund, I have been looking forward to hearing your take on it, primarily because I know that you at least appear to be a Giuliani supporter.”
“She just didn't kind of opine about things; she actually led.”
“She just didn't kind of opine about things, she actually led.”
“Let such as opine that the shadow of great personages can conceal the ineptitude of authors, make the most of this advantage. ”
“I just wanted you to kind of opine on how you are achieving those cost reductions.”
“We are seeing a little bit, and little bit is the operative word there, softer results in February than we saw in the fourth quarter but it's not an important month to us and I really don't have enough information now to kind of opine on our forward business.”
Lists
These user-created lists contain the word ‘opine’.
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GRE 2014
abate, abdicate, abase, aberrant, abeyance, abhor, abjure, abortive, abound, abrasive, abreast, abridge and 1577 more...
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Talk Talk
Words for Talking
( open list, randomness )squawk, gab, chatter, chitchat, blab, prattle, blather, discuss, hector, plead, cajole, harangue and 200 more...
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List of Impressive Dissertation Words
Extraordinary words that Johnston and Shea might try to use while writing their dissertations.
egress, limn, effluvium, asynchronous, imbibe, opine, cognoscente, gnosis, inchoate, cathect, austerity, prescient and 1 more...
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man gre
abase, abeyance, abreast, abscission, abscond, abyss, accede, accretion, acerbic, acidulous, acumen, adulterate and 481 more...
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Favs
'nuf said
guffaw, pontificate, regalia, appease, sage, epitome, posit, dissipate, delineate, congruent, erroneous, braggadocio and 20 more...
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gre2
aberrant, aberration, aboveboard, abrasive, abstemious, acme, admonish, affable, affluent, alacrity, allegory, alleviate and 1824 more...
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Serendipity's Words
defenestration, mercurial, syzygy, wicked, iniquitous, metastable, demimonde, entropic, ephemeral, irreligious, frisbee, manifold and 474 more...
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Words from Moby Dick
frigate, presumptuous, genteel, succor, hearthstone, gentry, factitious, bilious, insurgent, portent, enervate, genuflect and 303 more...
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All The Words
I enjoy collecting words, for I have no fear of them ever running out.
tatterdemalion, panopticon, idioglossia, hypnagogue, hypnopomp, defenestration, anacoluthon, scofflaw, affront, edifying, palimpsest, naufrage and 475 more...
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Just 'cause I like 'em, O
opacity, opaline, olfactory, orthoepy, orthoepy, oleaginous, obloquy, oasitic, obtrude, orthotic, overweening, ostinato and 125 more...
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Personal Vocabulary List
All my favourite words that I come across!
veritable, incongruence, rigamorole, letcherous, revolting, repulsive, reputrid, rapatious, forays, guise, placate, paradigm and 1162 more...
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elvesoncrack's Words
lachrymose, blustering, fjord, chihuahua, chiffon, catalytic, stile, gefilte, prosh, thwart, ralph, ickle and 379 more...
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sillygoose's Words
nefarious, waffle, dilettante, love, obstreperous, suggestible, fodder, plucky, trajectory, eclectic, juggernaut, demure and 115 more...
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newGRE
mostly from magoosh
imbue, verge on, nonchalant, deliberate, timorous, futile, provisional, dissect, checked, tinged, alluring, visionary and 1046 more...
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ADW1
obdurate, obstinate, behest, injunction, enjoin, circumspect, ensconce, discursive, lugubrious, doleful, somber, ken and 2476 more...
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ulyssean
... as in "by James Joyce"
stately, plump, aloft, gurgling, untonsured, chrysostomos, jowl, parapet, jesuit, indigestion, scutter, noserag and 688 more...
Tweets
Looking for tweets for opine.

reesetee Oops! That was me--got carried away, I suppose. Jan 14, 2009
qroqqa *eyeballs 'back-formation' tag.*
Not a back-formation. Though the noun 'opinion' is much older in both English and French than the verb 'opine', the verb does come from a Classical Latin verb. Jan 14, 2009
brtom "Must we accept the view of Empedocles of Trinacria that the right ovary (the postmenstrual period, assert others) is responsible for the birth of males or are the too long neglected spermatozoa or nemasperms the differentiating factors or is it, as most embryologists incline to opine ..."
Joyce, Ulysses, 14 Jan 21, 2007