Source : Webster's Revised Unabridged Dictionary (1913)

Reckon \Reck"on\, v. t. [imp. & p. p. {Reckoned}; p. pr. & vb.
   n. {Reckoning}.] [OE. rekenen, AS. gerecenian to explain;
   akin to D. rekenen to reckon, G. rechnen, OHG. rahnjan), and
   to E. reck, rake an implement; the original sense probably
   being, to bring together, count together. See {Reck}, v. t.]
   1. To count; to enumerate; to number; also, to compute; to
      calculate.

            The priest shall reckon to him the money according
            to the years that remain.             --Lev. xxvii.
                                                  18.

            I reckoned above two hundred and fifty on the
            outside of the church.                --Addison.

   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.

            He was reckoned among the transgressors. --Luke
                                                  xxii. 37.

            For him I reckon not in high estate.  --Milton.

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

            Faith was reckoned to Abraham for righteousness.
                                                  --Rom. iv. 9.

            Without her eccentricities being reckoned to her for
            a crime.                              --Hawthorne.

   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.]

   Syn: To number; enumerate; compute; calculate; estimate;
        value; esteem; account; repute. See {Calculate},
        {Guess}.

Reckon \Reck"on\, v. i.
   1. To make an enumeration or computation; to engage in
      numbering or computing. --Shak.

   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.

            ``Parfay,'' sayst thou, ``sometime he reckon
            shall.'' --Chaucer.

   {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} or {upon}, to count or depend on.

   {To reckon with}, to settle accounts or claims with; -- used
      literally or figuratively.

            After a long time the lord of those servants cometh,
            and reckoneth with them.              --Matt. xxv.
                                                  19.

   {To reckon without one's host}, to ignore in a calculation or
      arrangement the person whose assent is essential; hence,
      to reckon erroneously.

Source : WordNet®

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}]