reck·on·ing
/ˈrek(ə)niNG/
noun
[i][b]the action or process of calculating or estimating something.[/b][/i]
"last year was not, by any reckoning, a particularly good one"
synonyms: calculation, estimation, computation, working out, summation, counting;
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[i][b]a person's view, opinion, or [u]judgment[/u].[/b][/i]
"by ancient reckoning, bacteria are plants"
synonyms: opinion, view, judgment, evaluation, way of thinking, estimate, estimation, appraisal, consideration
"by her reckoning, it was high time her luck changed"
English
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So basically he's someone who is an approximator