[1] : The Collaborative International Dictionary of English v.0.48

think \think\, v. t. imp.  p. p. thought; p. pr.  vb. n.
   thinking. oe. thinken, properly, to seem, from as.
   thornyncean cf. methinks, but confounded with oe.
   thenken to think, fr. as. thornencean imp.
   thorn=ohte; akin to d. denken, dunken, os. thenkian,
   thunkian, g. denken, d"unken, icel. thornekkja to
   perceive, to know, thornykkja to seem, goth. thornagkjan,
   thornaggkjan, to think, thornygkjan to think, to seem,
   ol. tongere to know. cf. thank, thought.
   1. to seem or appear; -- used chiefly in the expressions
      methinketh or methinks, and methought.
      1913 webster

   note: these are genuine anglo-saxon expressions, equivalent
         to it seems to me, it seemed to me. in these
         expressions me is in the dative case.
         1913 webster

   2. to employ any of the intellectual powers except that of
      simple perception through the senses; to exercise the
      higher intellectual faculties.
      1913 webster

            for that i am
            i know, because i think.              --dryden.
      1913 webster

   3. specifically:
      a to call anything to mind; to remember; as, i would
          have sent the books, but i did not think of it.
          1913 webster

                well thought upon; i have it here. --shak.
          1913 webster
      b to reflect upon any subject; to muse; to meditate; to
          ponder; to consider; to deliberate.
          1913 webster

                and when he thought thereon, he wept. --mark
                                                  xiv. 72.
          1913 webster

                he thought within himself, saying, what shall i
                do, because i have no room where to bestow my
                fruits?                           --luke xii.
                                                  17.
          1913 webster
      c to form an opinion by reasoning; to judge; to
          conclude; to believe; as, i think it will rain
          to-morrow.
          1913 webster

                let them marry to whom they think best. --num.
                                                  xxxvi. 6.
          1913 webster
      d to purpose; to intend; to design; to mean.
          1913 webster

                i thought to promote thee unto great honor.
                                                  --num. xxiv.
                                                  11.
          1913 webster

                thou thought'st to help me.       --shak.
          1913 webster
      e to presume; to venture.
          1913 webster

                think not to say within yourselves, we have
                abraham to our father.            --matt. iii.
                                                  9.
          1913 webster

   note: to think, in a philosophical use as yet somewhat
         limited, designates the higher intellectual acts, the
         acts preeminently rational; to judge; to compare; to
         reason. thinking is employed by hamilton as
         "comprehending all our collective energies." it is
         defined by mansel as "the act of knowing or judging by
         means of concepts,"by lotze as "the reaction of the
         mind on the material supplied by external influences."
         see thought.
         1913 webster

   to think better of. see under better.

   to think much of, or to think well of, to hold in esteem;
      to esteem highly.
      1913 webster

   syn: to expect; guess; cogitate; reflect; ponder;
        contemplate; meditate; muse; imagine; suppose; believe.
        see expect, guess.
        1913 webster
see also:
thought thinking methinks thank to think better of better 
to think much of to think well of expect guess 

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As Well As, definition of term: As Well As
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