Source : Webster's Revised Unabridged Dictionary (1913)

Opine \O*pine"\, v. t. & i. [imp. & p. p. {Opined}; p. pr. & vb.
   n. {Opining}.] [L. opinari, p. p. opinatus; akin to opinus
   (in comp.) thinking, and perh. to E. apt: cf. F. opiner.]
   To have an opinion; to judge; to think; to suppose. --South.

Source : WordNet®

opine
     v 1: speak one's opinion without fear or hesitation; "John spoke
          up at the meeting" [syn: {speak up}, {animadvert}, {sound
          off}]
     2: expect, believe, or suppose; "I imagine she earned a lot of
        money with her new novel"; "I thought to find her in a bad
        state"; "he didn't think to find her in the kitchen"; "I
        guess she is angry at me for standing her up" [syn: {think},
         {suppose}, {imagine}, {reckon}, {guess}]