Thayer's Greek Lexicon

 1. to reckon, count, compute, calculate, count over
  1) to take into account, to make an account of
1a1. metaph. to pass to one's account, to impute
1a2. a thing is reckoned as or to be something, i.e. as availing
for or equivalent to something, as having the like force
and weight
  2) to number among, reckon with
  3) to reckon or account
2. to reckon inward, count up or weigh the reasons, to deliberate
3. by reckoning up all the reasons, to gather or infer
  1) to consider, take into account, weigh, meditate on
  2) to suppose, deem, judge
  3) to determine, purpose, decide

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This word deals with reality. If I "logizomai" or reckon that
my bank book has $25 in it, it has $25 in it. Otherwise I am
deceiving myself. This word refers to facts not suppositions.