| recklessness | (noun) the trait of giving little thought to danger | Synonyms: foolhardiness, rashness |
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| reckoner | (noun) a handbook of tables used to facilitate computation | Synonyms: ready reckoner |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: calculator, computer, estimator, figurer |
| reckoning | (noun) the act of counting; reciting numbers in ascending order | Synonyms: count, counting, enumeration, numeration, tally |
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| (noun) problem solving that involves numbers or quantities | Synonyms: calculation, computation, figuring |
| (noun) a bill for an amount due | Synonyms: tally |