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

reckon \reck"on\ re^k"'n, v. t. imp.  p. p. reckoned
   re^k"'nd; p. pr.  vb. n. reckoning. oe. rekenen, as.
   gerecenian to explain; akin to d. rekenen to reckon, g.
   rechnen, ohg. rehhan=on cf. goth. rahnjan, and to e.
   reck, rake an implement; the original sense probably being,
   to bring together, count together. see reck, v. t.
   1913 webster
   1. to count; to enumerate; to number; also, to compute; to
      calculate.
      1913 webster

            the priest shall reckon to him the money according
            to the years that remain.             --lev. xxvii.
                                                  18.
      1913 webster

            i reckoned above two hundred and fifty on the
            outside of the church.                --addison.
      1913 webster

   2. to count as in a number, rank, or series; to estimate by
      rank or quality; to place by estimation; to account; to
      esteem; to repute.
      1913 webster

            he was reckoned among the transgressors. --luke
                                                  xxii. 37.
      1913 webster

            for him i reckon not in high estate.  --milton.
      1913 webster

   3. to charge, attribute, or adjudge to one, as having a
      certain quality or value.
      1913 webster

            faith was reckoned to abraham for righteousness.
                                                  --rom. iv. 9.
      1913 webster

            without her eccentricities being reckoned to her for
            a crime.                              --hawthorne.
      1913 webster

   4. to conclude, as by an enumeration and balancing of
      chances; hence, to think; to suppose; -- followed by an
      objective clause; as, i reckon he won't try that again.
      prov. eng.  colloq. u. s.
      1913 webster

   syn: to number; enumerate; compute; calculate; estimate;
        value; esteem; account; repute. see calculate,
        guess.
        1913 webster
see also:
reckoned reckoning reck calculate guess 

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

reckon \reck"on\, v. i.
   1. to make an enumeration or computation; to engage in
      numbering or computing. --shak.
      1913 webster

   2. to come to an accounting; to make up accounts; to settle;
      to examine and strike the balance of debt and credit; to
      adjust relations of desert or penalty.
      1913 webster

            "parfay," sayst thou, "sometime he reckon shall."
      --chaucer.
      1913 webster

   to reckon for, to answer for; to pay the account for. "if
      they fail in their bounden duty, they shall reckon for it
      one day." --bp. sanderson.

   to reckon on to reckon upon, to count or depend on; to
      include as a factor within one's considerations.

   to reckon with,
      a to settle accounts or claims with; -- used literally
          or figuratively.
      b to include as a factor in one's plans or calculations;
          to anticipate.
      c to deal with; to handle; as, i have to reckon with
          raising three children as well as doing my job.
          1913 webster +pjc

                after a long time the lord of those servants
                cometh, and reckoneth with them.  --matt. xxv.
                                                  19.
          1913 webster

   to reckon without one's host, to ignore in a calculation or
      arrangement the person whose assent is essential; hence,
      to reckon erroneously.
      1913 webster
see also:
to reckon for to reckon on to reckon upon to reckon with to reckon without one's host 

[3] : WordNet (r) 2.0

reckon
     v 1: 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, opine, suppose, imagine, guess
     2: judge to be probable syn: calculate, estimate, count
        on, figure, forecast
     3: deem to be; "she views this quite differently from me"; "i
        consider her to be shallow"; "i don't see the situation
        quite as negatively as you do" syn: see, consider, view,
         regard
     4: make a mathematical calculation or computation syn: calculate,
         cipher, cypher, compute, work out, figure
     5: have faith or confidence in; "you can count on me to help
        you any time"; "look to your friends for support"; "you
        can bet on that"; "depend on your family in times of
        crisis" syn: count, bet, depend, look, calculate
     6: take account of; "you have to reckon with our opponents";
        "count on the monsoon" syn: count
see also:
think opine suppose imagine guess calculate 
estimate count on figure forecast see 
consider view regard cipher cypher 
compute work out count bet depend 
look 

[4] : Moby Thesaurus II by Grady Ward, 1.0

139 moby thesaurus words for "reckon":
   account, account as, account for, add, add up, algebraize,
   appraise, appreciate, approximate, assess, assume, attend to,
   bank on, be afraid, bear in mind, believe, calculate, call, cast,
   cipher, class, compute, conceive, conclude, conjecture, consider,
   contemplate, count, count on, daresay, deal with, deduce, deem,
   depend on, divide, divine, dope out, dream, enumerate, esteem,
   estimate, evaluate, expect, extract roots, fancy, feel, figure,
   figure in, figure out, figure up, foot, form an estimate, gather,
   gauge, give an appreciation, grant, guess, handle, have a hunch,
   have an idea, have an impression, have an inkling, have the idea,
   hold, hold as, imagine, include, infer, judge, lean on, let,
   let be, list, look after, look upon, look upon as, maintain,
   make an estimation, mark, measure, multiply, name, number, opine,
   pay attention to, place, prefigure, presume, presuppose,
   presurmise, prize, provisionally accept, put, rank, rate,
   reckon up, reckon with, regard, rely on, remember, repute, say,
   score, see to, set down as, settle accounts with, subtract, sum,
   sum up, suppose, surmise, suspect, take, take account of,
   take care of, take for, take for granted, take into account,
   take into consideration, take it, take to be, tally, tally up,
   think, think about, think of, total, total up, trow, trust in,
   understand, valuate, value, venture, view, view as, ween, work out,
   work up

Reckon >> R Words
Reckon, definition of term: Reckon
reckon_pag1.html