Definition of opine verb from the Oxford Advanced Learner's Dictionary

 

opine

 verb
verb
BrE BrE//əʊˈpaɪn//
 
; NAmE NAmE//ˈpaɪn//
 
Verb Forms present simple I / you / we / they opine
BrE BrE//əʊˈpaɪn//
 
; NAmE NAmE//ˈpaɪn//
 
he / she / it opines
BrE BrE//əʊˈpaɪnz//
 
; NAmE NAmE//oʊˈpaɪnz//
 
past simple opined
BrE BrE//əʊˈpaɪnd//
 
; NAmE NAmE//oʊˈpaɪnd//
 
past participle opined
BrE BrE//əʊˈpaɪnd//
 
; NAmE NAmE//oʊˈpaɪnd//
 
-ing form opining
BrE BrE//əʊˈpaɪnɪŋ//
 
; NAmE NAmE//oʊˈpaɪnɪŋ//
 
 
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opine that… (formal) to express a particular opinion He opined that Prague was the most beautiful city in Europe. The headmistress opined that the outing would make a nice change for them. Word Origin late Middle English: from Latin opinari ‘think, believe’.
See the Oxford Advanced American Dictionary entry: opine